E-mail: authentic013@steelpipes-fitting.com
WhatsApp: +86 13668807131
E-mail: authentic013@steelpipes-fitting.com
WhatsApp: +86 13668807131
May. 21, 2025
ASTM standards for stainless steel flanges mainly involve materials, manufacturing and testing requirements. The following are key standards and their application scope:
1. Material standards
ASTM A182/A182M
Scope of application: forged or rolled stainless steel flanges, pipe fittings, valves, etc.
Common grades:
304/304L (UNS S30400/S30403)
316/316L (UNS S31600/S31603)
321 (UNS S32100)
347 (UNS S34700)
Requirements: specify chemical composition, mechanical properties (such as tensile strength, yield strength) and heat treatment process.
ASTM A240/A240M
Scope of application: stainless steel plates, sheets and strips (raw materials for flange manufacturing).
Grade: Same as A182, but applicable to plate form.
2. Manufacturing and Dimension Standards
ASME B16.5
Pipe flanges and flanged fittings (NPS ½"~24"), covering pressure classes (Class 150~2500), flange types (WN, SO, SW, etc.) and sizes.
Compatible materials: ASTM A182 stainless steel flanges must comply with the size requirements of this standard.
ASME B16.47
Large diameter flanges (NPS 26"~60"), divided into Series A (MSS SP-44) and Series B (API 605).
ASME B16.36
Orifice flanges (for flow measurement), usually made of ASTM A182 materials.
3. Testing and Inspection Standards
ASTM A961/A961M
General requirements, including dimensional tolerances, markings, pressure tests, etc. of flanges.
Supplementary requirements: Nondestructive testing (such as RT, UT), hardness testing, etc. may be specified.
ASTM E165/E426
Liquid penetrant testing (PT) and eddy current testing (ET) methods for detecting surface defects.
4. Special application standards
ASTM A350/A350M
Forged steel flanges for low temperature use (such as LF2), but A182 is usually preferred for stainless steel flanges.
ASTM A403/A403M
Forged austenitic stainless steel pipe fittings (including flanges), but A182 is more commonly used.
5. Marking and certification
ASTM A182 flange marking must include:
Material grade (such as F304L), ASTM standard number, manufacturer identification, heat treatment batch number, etc.
Certification: A material report (MTR) is usually required, which complies with ASME Section IX or PED (EU Pressure Directive).
Example: ASTM A182 F316L flange
Material: 316L stainless steel (low carbon, corrosion resistant).
Pressure rating: Class 150 (according to ASME B16.5).
Size: NPS 4", WN (weld flange).
Test: Water pressure test according to ASTM A961, hardness test HB≤187.
Selection suggestions
Clear working conditions: pressure, temperature, medium (such as 316L for acidic environment).
Matching standard: Preferred combination of ASTM A182 + ASME B16.5.
Verification and certification: Suppliers are required to provide MTR and NDT reports (if necessary).
The above standards ensure that the material, size and performance of stainless steel flanges meet the requirements of industrial applications.
Cangzhou Aosendik Pipe Fittings Manufacturing Co., Ltd. is a large manufacturer specializing in the production of elbows, tees, reducers, elbows and caps. We can implement ASTM, ANSI, JIS, DIN, GB and other standards, basically covering all types of steel.
If you have any purchasing needs or questions, please contact us.
Mobile: 86-13668807131
Website: https://www.authenticfitting.com/
Address: Mengcun Hui Autonomous County, Cangzhou City, Hebei Province
Email: authentic013@steelpipes-fitting.com
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Authentic is here to help you find the right pipe fittings and flanges for your specific needs.
FAQ
What certifications do your products have?
Our products comply with international standards such as ASTM, ANSI, JIS, DIN, and GB. We also hold various certifications to assure quality and reliability, including ISO 9001.
How can I get some samples?
If you need, we will offer you samples for free, but new customers are expected to pay express charge.
To which country have you supplied your products?
We have supplied to Thailand, China Taiwan, Vietnam, India, South Africa, Sudan, Peru, USA, Brazil, Trinidad and Tobago, Kuwait, Qatar, Sri Lanka, Pakistan, Romania, France, Spain, Germany, Belgium, Ukraine etc. (Figures here only include our customers in latest 5 years.)
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authentic013@steelpipes-fitting.com
+86 13668807131
Donghe Industrial Zone, Mengcun County, Cangzhou City, Hebei Province
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