Свидетельства о проверке — en 10204

Remarking of Plates to EN10204

Plates always have a set of mill markings on them to enable them to be tracked and matched with the appropriate certificate. This is normally done through the aid of heat and plate numbers. However the plate markings only appear on one part of the plate. When a plate is cut or profiled this will leave one part of the pate without any mill markings and thus potentially untraceable. If this is the case it is not possible to claim that the plate meets a 3.1 or 3.2 MTC etc. To resolve this issue most stockholders have the authority to remark plates (based on their quality system and specific authorisation of a 3rd party inspector) to EN10204 3.2

Summary of EN10204 Inspection Documents

BS EN 10204:2004 Metallic Products: Types of Inspection Documents

Note: To print, please click here. 

Quite often our distributors are asked by end-users for a copy of inspection documents according EN 10204 (especially for the inspection Certificate 3.1 “type 3.1”). In this little bulletin we want to explain what those documents are.

BS EN 10204:2004 is a British Standard that supersedes standard BS EN 10204:1991 and specifies the different types of inspection documents supplied to the purchaser, in accordance with the requirements of the order, for the delivery of all metallic products e.g. plates, sheets, bars, tubes, forgings, castings, whatever their method of production.

Inspection certificate 3.1 “type 3.1” – is simply a document issued by the manufacturer in which he declares that the products supplied are in compliance with the requirements of the order and in which he supplies test results. The test unit and the tests to be carried out are defined by the product specification, the official regulation and corresponding rules and/or the order. The document is validated by the manufacturer`s authorized inspection representative, independent of the manufacturing department.

Manufacturer may transfer on to the inspection certificate 3.1 relevant test results obtained by specific inspection on primary or incoming products he uses (such as – for example – results of chemical composition analysis or mechanical properties of the strip, provided on the Material Test Reports supplied by the vendor of strip)

EN10204 2.2 Certification

EN10204 2.2 Certification is again issued by the steel mill. In this case the mill states that the steel meets the requirements of the customer’s specification or order and test results are included in the certificate to demonstrate that this is the case. There is no separation between the QA department who issue the certificate and the manufacturing department so with a 2.2 certificate it is possible that cases of conflict of interest could arise.

It is also worth noting that the test results may not actually reflect the products that are supplied. What this means is that manufacturer could have a sampling process for their QA system that tested 1% of plates. They then deliver test certificates for this 1% of plates with the order – but the plates actually supplied are never tested. You consequently rely on the strength of the mill’s QA system to be producing a homogenous product with little variability.

What is EN 10204 means?

When we purchasing steel products like seamless pipe, pipe fittings, sucker rod or steel plates,  manufacturer should release the MTC to the buyer. MTC is Mill Test Certificate, it contains all the specification of the steel pipe products. Including dimensions, sizes, weight, chemical composition, mechanical strength, heat treatment status, test result, traceability etc. These information is to make sure the quality of ordered steel products, tells the buyer what situations could be applied in engineering purposes. So the certificate standard for the MTC is generated, EN 10204 is European standard for the inspection documents for the steel products including steel line pipe, fittings, steel plate, valves, sucker rods etc. For certifying the results of the specific test is complied with client’s order.

Application of EN10204 Steel Plates

Generally the level of EN10204 certification for steel plates increases with the consequences of them failing under load. So for example many boiler plates are certified to EN10204 3.2 because consequences of failure of a vessel containing an explosive or toxic substance at high pressure could be catastrophic. The EN10204 certificate however doesn’t assure that the plate won’t fail though. What it does is it provides confidence to everyone in the supply chain that the plate meets the required standards and that this has been independently verified by at least two parties in the case of a 3.2 certificate. the mills test department and the 3rd party validation authority.

For many applications it is the role of the engineering authority to make the decision as to what level of certification is required if not already specified in a purchase order or by national or international regulations or laws.

EN10204 3.2 Certification

This is the most rigorous certification level available for steel plates. Like EN 10204 3.1 the test results of the actual plates being purchased are included on the Mill test certificate. The mill’s test department, again independent of the manufacturing department, has to validate the test results. However the purchaser, or the government’s representative have also to validate the test results as well.

What this means is that there is a person who is completely independent of the mill inspecting the test results and ensuring that that reflect the underlying physical and chemical characteristics of the steel plates. Being totally independent he is able to resist and pressure to collude in altering the results and misrepresent the product being sold.

In practice the major classification societies normally acts as the independent third party validation authorities. This may be because they have been appointed by the mill, or because a purchaser requires plates to be approved by a particular classification society; such as Lloyds, TUV or DNV.

Cost Implications of EN10204 Certification

As the level of certification the cost of the plates also increases. There are two reasons for this. Firstly there is an economic benefit to certifying better steel plates to a higher level. Secondly there are significant costs associated with establishment of test facilities, operational independence and the fees that third party inspectors charge for validation. Normally this costs are spread over millions of tonnes of steel and thus only have a small impact on a per plate basis. However where plates are upgraded at a later date from a EN10204 3.1 to 3.2 MTC then the costs are applied over a small number of plates.

About This Item

Full Description

Forward

This document (EN 10204:2004) has been prepared by Technical Committee ECISS/TC 9 «Technical conditions of delivery and quality control», the secretariat of which is held by IBN.

This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by April 2005, and conflicting national standards shall be withdrawn at the latest by April 2005.

This document supersedes EN 10204:1991.

This document has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association, and supports essential requirements of EU Directives 97/23/EC.

For relationship with EU Directive 97/23/EC, see informative Annex ZA, which is an integral part of this document.

The main changes are:

1 new definitions: «manufacturer» , «intermediary», «product specification»;
2 reduction of the number of inspection documents:
3 type 2.3 of the previous edition has been deleted;
4 type 3.1 replaces type 3.1.B of the previous edition;
5 type 3.2 replaces types 3.1.A, 3.1. C and the inspection report 3.2 of the previous edition.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.

Scope

This document specifies the different types of inspection documents supplied to the purchaser, in accordance with the requirements of the order, for the delivery of all metallic products e.g. plates, sheets, bars, forgings, castings, whatever their method of production.
This document may also apply to non-metallic products.

This document is used in conjunction with the product specifications which specify the technical delivery conditions of the products.

Table of Contents

i Foreword
1 Scope
2 Terms and definitions
3 Inspection documents based on non-specific inspection
4 Inspection documents based on specific inspection
5 Validation and transmission of inspection documents
6 Transmission of inspection documents by an intermediary
7 Annex A (informative) Summary of inspection documents
8 Annex ZA (informative) Relationship between this European Standard and the Essential
Requirements of EU Directive 97/23/EC
9 Bibliography

What does the Independent 3rd Party do Verify a EN 10204 3.2 Certificate

The surveyor, as they are known, will visit the steel mill and then identify the material that he (or she) has to verify.  This includes visual inspection of the steel plates, checking the dimensions of some on a sampling basis  and confirming that the steel plate can be traced all the way back to the ladle chemical analysis. This is usually done by using the mill’s EN 10204 3.1 certificate that has already been produced.

The key fact here is to establish that the plate has some marking on it that corresponds to the the test certificate which in turn has a documentation trail back to the analysis taking where the steel was being made. The marking on the plate needs to be permanent – ie stamped, etched or stencilled onto the plate. Paint, chalk and grease marks are not acceptable as they could easily be wiped off and replaced.

The 3.1 certificate is also checked to determine that the characteristics recorded on it comply with all the requirements of the standard and a;so for its chemical composition, heat treatment and any NDE testing. The surveyor then identifies the test sample from the plate or heat being tested and then visits the test centre whilst the test is being done.

As part of this they will consider not only the test results but also the test process and the calibration of the test machinery to ensure that the est results are reliable.

Once this is done and everything is in compliance the surveyor then returns to the steel mill and signs and stamps the en 10204 3.2 test certificate and ensures that the product being verified is stamped.

Сертификат 3.1 по EN 10204

Сертификат 3.1 требует от производителя выполнять ряд важных требований. Во-первых, производитель должен выполнить испытания именно той партии продукции, например, стальных плит, которая непосредственно продается. Поэтому результаты испытаний по сертификату относятся к поставляемой продукции и характеризуют свойства той партии, которая поставляется – в тех пределах, которые позволяет применяемая методика отбора образцов.

Во-вторых, к этому сертификату предъявляется требование, чтобы испытания проводились испытательной лабораторией, которая формально является независимой от производства, например, прокатного стана. Это означает, что производственное подразделение – цех – не производит испытания и не имеет власти, чтобы изменить результаты испытаний или повлиять на них. В сочетании с системой качества, такой как по EN 9001:2010, сертификат 3.1 по EN 10204 значительно более авторитетный, чем сертификаты 2.1 и 2.2.

Buying Steel from Steel Stockholders and EN10204

In many cases you may not buy steel directly from the mill. In these cases you won’t always receive an original certificate. This is acceptable so long as you receive a copy and it is clear that the copy can be traced back to the original certificate and that the original document can be produced on request.

What this means in practice is that the original purchaser of the steel plates produces a “Certified True Copy” of the certificate and keeps the original in their records department. The person who has bought the steel then does the same thing and this repeats until the steel is kept by the eventual end users. Thus there should always be a clear audit trail to establish the origin and provenance of the steel plate

Можно ли использовать наши рукава с коэффициентом безопасности меньше 1:2,5?

Снижение коэффициента безопасности до значения 1:2 возможно при наличии следующих условий:

Нагрузка настолько низка, что может быть достигнут приемлемый срок эксплуатации (например, использование в статическом режиме без пульсации давления). В каждом конкретном случае это должно быть выяснено заказчиком в ходе испытаний

Претензии к изготовителю из-за малого срока эксплуатации в этом случае, конечно, исключены.
Пользователь должен предпринять все необходимые меры предосторожности для того, чтобы исключить возникновение травмоопасной ситуации в случае выхода из строя рукава. Это может быть реализовано, например, посредством закрытого помещения с аварийным выключателем на двери, который бы автоматически снижал давление до 0 бар при её разблокировке.

2 Нормативные ссылки

Для применения настоящего стандарта необходимы следующие ссылочные документы. Для дати-рованных ссылок применяют только указанное издание ссылочного документа, для недатированныхссылок применяют последнее издание ссылочного документа (включая все его изменения).

EN 10020:2000 Определение терминов по классификации стали

EN 10079:1992 Определение терминов изделий из стали

EN ISO 377 Сталь и изделия из стали. Положение и подготовка контрольных проб и образцов для механических испытаний

EN ISO 7500-1:2004 Металлы. Калибровка установок для статических одноосных испытаний. Часть 1. Установки для испытания на растяжение/сжатие. Поверка и калибровка системы измерения нагрузки

EN ISO 15630-1 Сталь для армирования и предварительного напряжения бетона. Методы испыта-ний. Часть 1. Арматурные стержни, катанка и проволока

EN ISO 15630-2 Сталь для армирования и предварительного напряжения бетона. Методы испы-таний. Часть 2. Сварная арматурная сетка.

Настоящий стандарт EN 10080 идентичен европейскому стандарту EN 10080:2005 Stahl für die Bewehrung von Beton — Schweiβgeeigneter Betonstahl — Allgemeines (Арматура для железобетонных конструкций. Арматура свариваемая. Общие технические условия).

Европейский стандарт разработан техническим комитетом по стандартизации ECISS/TC 19 «Ненапрягаемая и напрягаемая арматура для железобетонных конструкций. Показатели, размеры, предельные отклонения и испытания», секретариат которого находится при DIN. Настоящий стандарт реализует существенные требования безопасности Директивы 89/106/ ЕЕС, приведенные в приложении ZA. Перевод с немецкого языка (dе).

Введение к европейскому стандарту EN 10080

1 Область применения2 Нормативные ссылки 3 Термины и определения4 Обозначения 5 Маркировка

5.1 Стержневая арматура, проволочная арматура в состоянии поставки и после правки

5.2 Сварная сетка

5.3 Каркасы

6 Изготовление стали и технология изготовления изделий

7 Технические характеристики

7.1 Свариваемость и химический состав

7.2 Механические показатели

7.3 Размеры, масса и предельные отклонения.

7.4 Прочность сцепления и параметры периодического профиля.

7.5 Методы контроля технических характеристик.

8 Оценка соответствия.

8.1 Заводской производственный контроль.

8.2 Постановочные испытания.

8.3 Текущий заводской производственный контроль и приемо-сдаточные испытания

8.4 Обработка результатов, подготовка протоколов и принятие мер

8.5 Определение долговременного уровня качества

9 Методы испытаний

9.1 Арматура

9.2 Сварные сетки

9.3 Каркасы из арматры А500

10 Идентификация изготовителя и классов прочности

10.1 Стержневая арматура

10.2 Проволочная арматура в состоянии поставки

10.3 Проволочная арматура после правки

10.4 Сварные сетки

10.5 Каркас

11 Подтверждение механических свойств в случае разногласий

Приложение А (справочное) Эскизы с примерами конструкции сварных соединений в каркасе. 

Приложение В (обязательное) Методы контроля каркасов

Приложение С (справочное) Контроль сцепления арматуры периодического профиля Испытания с применением балки 

Приложение D (справочное) Контроль сцепления арматуры периодического профиля Испытания на вытягивание 

Приложение Е (справочное) Сравнение символов, применяемых в настоящем стандарте, с принятыми в EN 1992-1-1 и 1992-1-2. 45

Скачать EN 10080 можно после регистрации

Upgrading EN 10204 3.1 Certificates to EN 10204 3.2

A classification society can be appointed to upgrade 3.1 plates at a stockist to EN 10204-3.2. He does this by reviewing the 3.1 certificate and then visually inspecting the plate to ensure that it meets the dimensions of the certificate. He’ll also ensure that the heat or other markings on the plate enable the plate to be traced back to the chemical analysis in the ladle.

Once this is done the surveyor will also check the certificate to confirm compliance of

• chemical analysis
• mechanical properties
  • tensile
  • impact
  • hardness
  • bend tests
  • through thickness
• Heat treatment
• Plate Condition
• Corrosion
• NDT testing such as UT

The plate also needs to be retested so a test specimen will be cut and sent to a test facility where the testing will be witnesses by the surveyor. If all is acceptable a certificate will be issued by the classification society that st states that the material has been inspected to the intent of EN 10204 3.2 supported by the original 3.1 mill certificate and the lab test report. The phrasing here is important  as what the classification society is not a true 3.2 mill certificate but one that fulfills the intent of the standard. In most cases this is sufficient but there will be the rare case where this is not acceptable and mill tested 3.2 plate will have to be purchased instead.

The surveyor will issue a certificate of conformance that details the scope of inspection with EN 10204 3.2 or the intent of EN 10204 3.2 as appropriate.

MILL TEST CERTIFICATE

A mill test certificate to EN 10204 shows, generally, the following information:

• Type of certificate and standard (example EN 10204 3.1 or EN 10204 3.2)
• Manufacturer name
• Product name and dimensions
• Quantity covered by the certificate (example: tons, with heat numbers)
• Heat numbers and batch number (physically shown on the product as well)
• Final test result
• Dimensional measurements, to check compliance with allowed tolerances (example, for steel pipes: diameter, wall thickness, length, straightness)
• Material grade and applicable specification, including results of chemical and mechanical tests
• Results of additional tests, like hydrostatic, ultrasounds (UT), hardness, impact test, magnetic particles, metal graphic result etc.
• Addenda useful to appraise the full features of the product

Sample mill test certificate (Tenaris steel pipes).

EN10204 History

EN 10204  originally started off as DIN 50049 which was a German DIN standard specifying the test certificate requirements for metallic products. When CEN started the process of harmonising European standards in the late eighties it was decided that the German standard fitted the new requirements best (in part because of the heavier influence of manufacturing in Germany and the rapid rise of the concept of Total Quality Management which led to ISO9001). As a result the new European standard in 1991 drew significantly on the German certificate names and definitions.

With broader use and acceptance of test certificates there was pressure to clarify some of the issues and in 2004 the standard was reissued with the list of certificates available reduced and simplified.

TYPES OF MILL TEST CERTIFICATE (EN 10204 2.1, 2.2, 3.1, 3.2)

EN 1024 3.1 MILL TEST CERTIFICATE

Как определяется минимальный радиус изгиба рукавов сверхвысокого давления?

Минимальный радиус изгиба резиновых гидравлических рукавов измеряется стандартизированным методом сплющивания. Для рукавов сверхвысокого давления этот метод неприменим из-за их более высокой устойчивости к деформации. По этой причине производители рукавов сверхвысокого давления устанавливают минимальный радиус изгиба по своему усмотрению следующим образом:
Сначала конструктор определяет минимальный радиус изгиба на основе опытных данных

В процессе импульсных испытаний минимальный радиус изгиба проверяется и, при необходимости, исправляется.
При этом важно заметить, что для минимального радиуса изгиба нет жёстко установленной границы, а есть принципиальное отношение между изгибом и импульсной устойчивостью. Каждый изгиб, даже с радиусом, превышающим минимальный, вызывает в материале внутреннего слоя рукава сверхвысокого давления растягивающее напряжение на внешней стороне и сжимающее напряжение на внутренней стороне колена

Эти напряжения суммируются с осевым и радиальным напряжениями, вызванными эксплуатационным давлением, и снижают тем самым импульсную устойчивость. В этой связи речь идёт о многоосном напряженном состоянии. Чем меньше радиус изгиба, тем больше вызванное этим напряжение материала внутреннего слоя, и тем меньше импульсная устойчивость рукава сверхвысокого давления. Если представить эту зависимость в графическом виде, то получится дегрессивная кривая, так называемая кривая Вёлера. Она проходит асимптотически по отношению к определённой предельной величине, в данном случае к минимальному радиусу изгиба. Эта предельная величина показывает, начиная с какого радиуса изгиба импульсная устойчивость рукава, установленного в согнутом виде, не отличается от таковой выпрямленного рукава сверхвысокого давления. Поскольку определение кривой Вёлера связано с большими сложностями и, кроме того, может быть только примерным, существует большая свобода действий в определении минимального радиуса изгиба. Поэтому указанный в каталоге минимальный радиус изгиба отображает в значительной степени готовность фирмы-производителя пойти на риск.

Differences between EN 10204-3.1 and 3.2 for the MTC

EN 10204 contains 4 types of document type, 2.1, 2.2, 3.1 and 3.2. Type 2.1 and 2.2 are validated by the manufacturer. Type 3.1 and 3.2 are not only validated by manufacturer.
Type 2.1, The content is statement of compliance with the order. Validated by manufacturer.
Type 2.2, Statement of compliance with the order, with indication of results of non specific inspection. Validated by manufacturer.
Type 3.1, Statement of compliance with the order, with indication of results of specific inspection. Authorized inspection representative by the manufacturer, but is independent of the manufacturing department.
Type 3.2, Statement of compliance with the order, with indication of results of specific inspection. Authorized inspection representative by the manufacturer, independent of manufacturing department and either the buyer’s authorized inspection representative or the inspector designated by the official regulations.

EN 10204-3.1 type quality certificate.

It requires the manufacturer to show the actual test result for the steel pipes on sale. According the related standard sampling methods.

3.1 MTC requires the test agency shall be an independent party, mill has no rights to revise the test results.

If a steel pipe manufacturer passed the audit for the ISO 9001 from a certification agency of European Union, then this manufacturer have the qualification to release the EN 10204-3.1 MTC. The buyer information shall be specified on the MTC quality certificate, and one buyer need one MTC quality certificate. If the manufacturer didn’t pass ISO 9001 or the ISO 9001 certificate not from European Union Inspection Agency, then the manufacturer do not have right to release MTC of EN 10204-3.1. In this case, manufacturer shall apply for the EN 10204-3.2 quality certificate from the third part of inspection agency.

EN 10204-3.2 type quality certificate.

EN 10204 3.2 certificate is the most restrict standard level for the steel pipe products.It indicates the certification shall be additional countersigned and verified by independent related all the tests, 3.2 certificate cost higher than 3.1. Not only manufacturer test department, but also a completely independent part. Third party inspector, or the personal, buyer, or government’s representative also have right to verify the test results.

EN 10204-3.2 certificate must released by the inspection agency that authorized by the European Union. Through the related inspection or the test for the material that ordered, to certify that the test result is the same with the PO from a third party inspection agency. Also on the quality certificate of EN 10204-3.2 shall specify the name of manufacturer and the buyer.

EN 10204 certificate related steel pipe MTC in following specs.

• Chemical composition
• Mechanical strength
• Impact strength
• Tensile strength
• Hardeness test
• Bend test
• NDE
• Visual and Dimensions
• Hydro test
• NDT test
• Magnetic test
• Pipe end
• Corrosion HIC status
• Heat no

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