Views: 29 Author: Site Editor Publish Time: 2024-10-29 Origin: Site
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.
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.
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 | - |