Pipe & fittings Standards

With the rapid expansion in the global trade, standardization of various products has become an essential requirement. The standards given to various products significantly contributes towards increasing international trade which in turn bridges the quality gap between the manufacturers, producers and buyers of different nations.

ASTM A333 Grade 6 alloy pipe shall be made by the seamless or welding process with the addition of no filler metal in the welding operation.
Standard Specification for Seamless and Welded Steel Pipe for Low-Temperature Service and Other Applications.
ASTM A335 P22 is the part of ASTM A335, the pipe shall be suitable for bending, flanging, and similar forming operations, and for fusion welding.
Astm A335 standard specication for seamless ferritic alloy-steel pipe for high-temperature service
Standars for Tubing and Casing, Line Pipes
API Spec 5L
is the American Petroleum Institute specification API 5L covers seamless and welded steel line pipe.
API Spec 5CT
API Spec 5CT
Specification for Casing and Tubing, Eighth Edition, Petroleum and natural gas industries-Steel pipes.

ASTM/ ASME- Standards for pipes

Standards organizations impacting steel piping

DIN/EN- European Standards for steel

Germany Safety(GS), Deutsches Institut für Normung(DIN)

Product name Executive standard Dimension (mm) Steel code/ Steel grade
Seamless Steel Tubes for Elevated Temperature DIN 17175 10~762 x 1.0~120 St35.8,St45.8, 10CrMo910, 15Mo3, 13CrMo44, STPL340, STB410, STB510, WB36
Manufacturing pipeline,vessel,equipment,pipe fittings. DIN 1629 13.5~762 x 1.8~120 St37.0, St44.0, St52.0
Seamless steel tubes for pressure purposes EN 10216 4.0~60.0 x 0.5~8
5-7 m manufacturing lenght
P235GH TC1, P235GH TC2, 16Mo3
Seamless precision steel tube applications EN 10305-1 13.5~165.1 x 1.8~4.85 St33.2
Seamless Precision Steel Tube DIN 2391 4.0~60.0 x 0.5~8 St35, St45, St52
Seamless Steel Tubes DIN 2440 13.5~165.1 x 1.8~4.85 St33.2

Japanese Industrial Standards (JIS) specifies the standards used for industrial activities in Japan.

Product name Executive standard Dimension (mm) Steel code/ Steel grade
High pressure and high temperature service JIS G3454/5/6 19.05~114.3 x 2.0~14 JIS G3454(STPG370, STPG410), JIS G3455(STS370, STS410, STS480), JIS G3456(STPT370, STPT410, STPT480)
Tubes used for machinery, automobiles, bicycles, furniture, appliances and other machine parts. JIS G3445 19.05~114.3 x 2.0~14 STKM11A, STKM12(A,B,C), STKM13(A,B,C), STKM14(A,B,C).
Carbon steel/Alloy steel boiler and heat exchanger tubes JIS G3461,2 19.05~114.3 x 2.0~14 G3461(STB340, STB410, STB510)
G3462(STBA22, STBA23)
Seamless steel tubes for high pressure gas cylinder JIS G3429 19.05~114.3 x 2.0~14
Length: max 16000mm
STH11, STH12, STH21, STH22
GB 国标

The Standardization Administration of China (SAC) is the member body to the ISO.

Product name Executive standard Dimension (mm) Steel code/ Steel grade
Low and medium pressure boiler seamless pipe GB 3087 19.05~114.3 x 2.0~14 10#, 20#
Low-temperature heat exchanger tubes seamless steel pipe GB/T18984 19.05~351 x 2.0~14 06Ni3MoDG, 09DG, 09Mn2VDG, 10MnDG, 16MnDG
High pressure and above pressure steam boiler tubes with high quality carbon structural. GB5310 19.05~114.3 x 2.0~14 20G, 20MnG, 25MnG, 15MoG, 20MoG, 12CrMoG, 15CrMoG(T12/P12), 12CrMoG, 12Cr2MoWVTiB.

Difference between “Standard” and “Codes”:

Piping codes imply the requirements of design, fabrication, use of materials, tests and inspection of various pipe and piping system. It has a limited jurisdiction defined by the code. On the other hand, piping standards imply application design and construction rules and requirements for pipe fittings like adapters, flanges, sleeves, elbows, union, tees, valves etc. Like a code, it also has a limited scope defined by the standard.


This list of standards organizations is not complete, but instead has been chosen to reflect the complexity and variation of standardization throughout the world and demonstrate the standards that a metal engineer may run into while specifying a product.


  • ISO: International Organization for Standardization
    • It might look like “ISO” is a mistaken acronym—shouldn’t it be “IOS”? No; ISO is not meant to be an acronym. The prefix “iso” is from Greek, meaning “equal.” ISO is a global network of the top standards organizations in each country. ISO offers standards for metals separate from but informed by global member organizations.
  • ASTM International: American Standard for Testing and Materials
    • ASTM was originally an American standards organization but now has 12,000 standards in 140 participating countries. ASTM integrates the standards of smaller industry-led standards organizations (see AISI and ASME below.)


  • AISI: The American Iron and Steel Institute
    • Started in 1855 as the American Iron Association to “take proper measures for advancing the interests of the trade in all its branches,” AISI was one of the first to provide North American standards for various steel product lines.
  • ASME: The American Society of Mechanical Engineers
    • Mechanical engineers founded this organization in 1880. In 1905, a boiler explosion caused ASME to start looking towards creating standards to safeguard and prevent similar tragedies from unfolding again. Steel standards are important for ASME since material properties determine safe working loads.
  • ANSI: American National Standards Institute
    • ANSI is the top-level umbrella organization providing oversight in the US, and is the American member body to ISO. Formed in 1918, it manages the voluntary consensus standards for products, services, processes, systems, and personnel in the US.
  • CSA Group: Canadian Standards Association
    • The Canadian Standards Association specifies steel in Canada. It formed in 1919 when industry found that the inability to communicate easily made it difficult for Canadian companies to respond quickly enough to the war effort. Standardizing industrial processes made it possible for industry to merge production in a way that had never been tried. CSA works on an industrial level, but there is a higher body, the SCC or Standards Council of Canada, which is the ANSI equivalent. In Canada, it is a public corporation, not a private one.
  • DGN: Dirección General de Normas
    • This standards organization is the Mexican member body of the ISO. It’s a governmental agency rather than a voluntary one, creating standards and exercising the powers and regulations of several governmental departments.


Europe has three umbrella bodies: CEN, CENELEC, and ETSI. In steel specification, it is more common to run into the following:

  • DIN: Deutsches Institut für Normung
    • First founded as an industry standards organization in 1917, DIN was recast as major standards organization in the 1920s. This is Germany’s member body of ISO.
  • BSI Group: British Standards Institution
    • BSI was the world’s first National Standards body, formed in 1901. One of its very first specifications was for the steel to be used in tramways, to ensure safety and durability. It is one of the founders of the ISO, and the British member body to that organization.


  • JISC: Japanese Industrial Standards Committee
    • The JISC is the Japanese member body of the ISO and maintains the JIS, or Japanese Industrial Standards, which were established during WWII to simplify material output. In 1949 laws were enacted to create the legal foundation of the JIS.
  • GB: Guobiao
    • The Standardization Administration of China (SAC) is the member body to the ISO. The standards it issues are known as the GB or Guobiao standards. These are the basis for product testing and certification in China.
Specifying in practice

Across all these specifications, there are often clear substitutions for commonly-used alloys. The previously mentioned ASTM 1050 steel might be substituted for GB#50 or JIS S 50 C. For each specification, there are small variations in chemistry. An engineer with knowledge of the application can advise whether these differences will be a problem to the final product.

In most cases, what really changes is not the metal, but the paperwork. Even if the standards are slightly different, the material that comes out at the end will be almost the same. In this, specifying metal is a bit like mixing paint colors, in which measured additions of pigment are added to a base paint. Two almost identical colors will be called different names by different manufacturers and will have varying pigment allowances. Further, each mixed batch of paint may be minutely different from the last. Still, experts know what substitutions can be made between manufacturers, and a neon green will never be mistaken for a ruby red.

Similarly, a metallurgist will know what “close enough” means. When designing a product, engineers will include a safety factor. This means that they overdesign the product, so that the material can withstand greater forces than those for which they are rated (a typical safety factor when human life is at stake is a factor of five). This safety factor is generally at least an order of magnitude larger than the slight variations in mechanical properties that exist between standards, so the variations do not become design concerns.

Exceptions to this are in military and aerospace applications, where the tolerance for variance is much, much smaller. Even a slight shift in mechanical properties can spell disaster. For these cases, the same standard must always be rigorously applied.

Standards for flanges & fittings

AWWA standards
- evaluate properties that particularly affect potable water use, as opposed to broader industrial flange applications.
ASTM A333 Grade 6 alloy pipe shall be made by the seamless or welding process with the addition of no filler metal in the welding operation.
ANSI standards
-approved flanges are used for the industrial market which handles gas, air and steam process systems.
Specification for Piping Fittings of Wrought Carbon Steel and Alloy Steel for Moderate and High Temperature Service.
ASTM A420 WPL6 90 degree short radius Elbow
Our Stainless Steel Pipes meets mainly the following standards:
ASTM-A511-Seamless-Stainless-Steel-Tubing.jpgASTM A511 Standard Specification
ASTM A312 stainless steel
ASTM A312 stainless steel
Stainless steel pipes for oil cracking ANSI Standards Stainless Steel
Recommend steel products

We provide our customer with mainly steel pipe include carbon steel seamless tube,stainless seamless tube, alloy seamless tube,seamless pipe, welded pipes and ceramic lined pipe. The fittings include bend pipe, flange, cap, tees and cross, elbow, and reducers etc.

Pipe flange, Flanges
are integral parts of many engineering and plumbing projects.
Pipe fittings
Pipe fittings
are used to connect pipes comprises of bend, elbow, reducer, tees, cross etc.
ASTM A335 Chrome monly pipe
Chrome monly pipe
Chorme-Moly is a seamless ferritic Alloy-Steel Pipe for high temperature service.
ASTM A179 Heat Exchanger tube
A179 exchange tube
for tubular, heat exchanger, condensers, heat transfer services.
Low Temperature Pipe
Low Temperature Pipe
ASTM A333 (ASME S/A-333) Pipe grades permit low temperature service.
Ceramic lined pipe
is made through self-propagating high-temperature synthesis (SHS) technique.
ceramic ring lined pipe
In the electric power, metallurgy, chemical industry, mining, cement...
Alloy pipes stock
These offered alloy pipes are available with us in divergent sizes and ...


Our team are highly trained and experienced in servicing and producing all types of steel supplies. Whether you've got a large construction project, or need parts for industrial machinery, our team of steel fabrication consultants will ensure that your project is provided with the parts you need, when you need them.

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