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Stainless Steel Grades Chart

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Professional terminology

What is the meaning of ASTM grade?



ASTM stands for the American Society for Testing and Materials, now known as ASTM International. This organization develops and publishes technical standards for a wide range of materials, products, systems, and services.

ASTM grades define the mechanical and chemicalproperties required for specific types of metals, including stainless steels. ASTM standards are widely used in industries to ensure consistency in quality, performance, and safety of materials and products.



What is the meaning of AISI ?



AISI stands for the American Iron and Steel Institute. Historically, AISI worked with SAE (Society of Automotive Engineers) to develop a standardized system for identifying steels. Although the AISI no longer oversees these classifications, the system is still widely used, especially in the U.S.

AISI grades categorize stainless steel and other alloys based on their chemical composition. For instance, AISI 304 indicates a specific type of stainless steel that contains about 18% chromium and 8% nickel. The AISI classification is well-known for stainless steels, where numbers like 304. 316. and 321 denote specific stainless steel types with distinct properties.



What dose UNS mean?



UNS stands for the Unified Numbering System. It's a systematic way to identify alloys used in North America, covering all metals and alloys, including ferrous and non-ferrous metals.

Each UNS number is a five-digit alphanumeric code that uniquely identifies a specific alloy composition. For example, S30400 corresponds to AISI 304 stainless steel. UNS numbers help eliminate confusion by standardizing alloy designations across ASTM, AISI, and other systems.



In summary:

ASTM standards focus on performance requirements.

AISI grades classify alloys based on composition.

UNS numbers uniquely identify alloys, helping align naming conventions across different systems.


Comparison table of various standard stainless steel grades

EN-DIN Standard steel grade EN-Standard grades ASTM / AISI Steel Grade UNS serial number GB-China National Standard No.
1.4310 X10CrNi18-8 301 - 0Cr18Ni9
1.4318 X2CrNiN18-7 301LN - -
1.4307 X2CrNi18-9 304L S30403 -
1.4306 X2CrNi19-11 304L - 00Cr18Ni10
1.4311 X2CrNiN18-10 304LN S30453 06Cr19Ni10 (GB/T3280-2007)
1.4303 X5CrNi18-10 304 - 0Cr18Ni9
1.4301 X5CrNi18-10 304 S30400 0Cr18Ni9
1.4948 X6CrNi18-9 304H S30409 -
1.4541 X6CrNiTi18-10 321 S32100 0Cr18Ni10Ti
1.4878 X2CrNiTi18-9 321H S32109 0Cr18Ni10Ti
1.4404 X2CrNiMo17-12-2 316L S31603 00Cr17Ni14Mo2
1.4435 X2CrNiMo18-14-3 316L S31603 00Cr17Ni14Mo2
1.4401 X5CrNiMo17-12-2 316 - 0Cr17Ni12Mo2
1.4432 X2CrNiMo17-12-3 316L S31603 00Cr17Ni14Mo2
1.4406 X3CrNiMo17-13-3 316LN S31653 0Cr17Ni12Mo2
1.4571 X6CrNiMoTi17-12-2 316Ti - 0Cr17Ni12Mo2
1.4429 X2CrNiMoN17-13-3 316LN S31653 00Cr17Ni14Mo2
1.4438 X2CrNiMo18-15-4 317L S31703 -
1.4512 X6CrTi12 409 S41000 0Cr13
1.4006 X10Cr13 410 - 1Cr13
1.4016 X6Cr17 430 - 1Cr17
1.4118 X40CrMo15 440A S44002 8Cr13
1.4125 X105CrMo17 440C S44004 9Cr13
1.4539 X1NiCrMoCu25-20-5 904L N08904 00Cr20Ni25Mo4.5Cu
1.4547 X1CrNiMoCuN20-18-7 - S31254 -





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