ASTM A240 plate Standard Specification.pdf
What is ASTM A240?
ASTM A240 is Standard Specification for Chromium and Chromium-Nickel Stainless Steel PlateSheet, and Strip for Pressure Vessels and for General Applications, It defines the chemical composition and mechanical properties for a wide range of stainless steel grades, including common types like 304/304L and 316/316L. The standard also provides guidelines for sampling and certification.
What is the equivalent of ASTM A240?
The ASME equivalent of ASTM A240 is ASME SA-240, which is used for pressure vessels. Other equivalent standards vary by the specific stainless steel grade covered by A240. Examples include the UNS (Unified Numbering System) grades like S30400 for grade 304, JIS (Japanese Industrial Standard) grades such as SUS304 for grade 304, and EN (European Standard) grades like 1.4301 for grade 304.
What is ASTM A240 Grade?
| Type | Raw Material |
|---|---|
| 304 | 18 - 8 Chromium Nickel Austenitic Stainless Steel |
| 316L | Low Carbon, Chromium Nickel Molybdenum Austenitic Stainless Steel |
| 321 | Titanium Stabilized 18 - 8 Chromium Nickel Austenitic Stainless Steel |
| 410 | 12% Straight Chromium Martensitic Stainless Steel |
| 904L | High Nickel Molybdenum Super Austenitic Stainless Steel |
| UNS S31803 | Ferritic / Austenitic Duplex Stainless Steel |
| UNS S32750 | Ferritic / Austenitic Super Duplex Stainless Steel |
| UNS S31254 | High Moly Austenitic Stainless Steel |
ASTM A240 Chemical Composition
| Element | 304 | 316 | 321 | 410 | 904L | S31803 | S32750 | S31254 |
|---|---|---|---|---|---|---|---|---|
| Carbon | 0.07 | 0.08 | 0.08 | 0.08 - 0.15 | 0.02 | 0.03 | 0.03 | 0.02 |
| Manganese, max | 2.00 | 2.00 | 2.00 | 1.00 | 2.00 | 2.00 | 1.20 | 1.00 |
| Phosphorus, max | 0.045 | 0.045 | 0.045 | 0.040 | 0.045 | 0.030 | 0.035 | 0.030 |
| Sulfur, max | 0.030 | 0.030 | 0.030 | 0.030 | 0.035 | 0.020 | 0.020 | 0.010 |
| Silicon | 0.75 | 0.75 | 0.75 | 1.00 | 1.00 | 1.00 | 0.80 | 0.80 |
| Chromium | 17.50 - 19.50 | 16.00 - 18.00 | 17.00 - 19.00 | 11.50 - 13.50 | 19.00 - 23.00 | 21.00 - 23.00 | 24.00 - 26.00 | 19.50 - 20.50 |
| Nickel | 8.00 - 10.50 | 10.00 - 14.00 | 9.00 - 12.00 | 0.75 | 23.00 - 28.00 | 4.50 - 6.50 | 6.00 - 8.00 | 17.50 - 18.50 |
| Molybdenum | ... | 2.00 - 3.00 | ... | ... | 4.00 - 5.00 | 2.50 - 3.50 | 3.00 - 5.00 | 6.00 - 6.50 |
| Nitrogen | 0.10 max | 0.10 max | 0.10 max | ... | 0.10 max | 0.08 - 0.20 | 0.24 - 0.32 | 0.18 - 0.25 |
| Copper, max | ... | ... | ... | ... | 1.00 - 2.00 | ... | 0.50 | 0.50 - 1.00 |
| Titanium | ... | ... | 5 x (C+N) - 0.70 | ... | ... | ... | ... | ... |
ASTM A240 Physical Properties
| Type | Tensile Strength, ksi, min | Yield Strength, ksi, min | Elongation, % min | Hardness, max^A |
|---|---|---|---|---|
| 304 | 75 | 30 | 40 | 201 HBW or 92 HRB |
| 316 | 75 | 30 | 40 | 217 HBW or 95 HRB |
| 321 | 75 | 30 | 40 | 217 HBW or 95 HRB |
| 410 | 65 | 30 | 20 | 217 HBW or 96 HRB |
| 904L | 71 | 31 | 35 | 95 HRB |
| UNS S31803 | 90 | 65 | 25 | 293 HBW or 31 HRC |
| UNS S32750 | 116 | 80 | 15 | 310 HBW or 32 HRC |
| UNS S31254 | 100 | 45 | 35 | 223 HBW or 96 HRB |
What is the difference between ASTM A240 and ss304?
ASTM A240 is a specification that defines the requirements for a range of stainless steel grades, while "ss304" refers to the specific 304 grade within that specification. Think of ASTM A240 as the rulebook, and ss304 as the specific product type that must adhere to certain rules in that book. Therefore, there is no difference between ASTM A240 and ss304; rather, ss304 is a type of stainless steel that is manufactured according to the ASTM A240 standard.
What is the difference between ASTM A240 and ASTM A666?
ASTM A240 covers chromium and chromium-nickel stainless steel for pressure vessels and general applications, focusing on the material specification of plates, sheets, and strips. In contrast, ASTM A666 is a standard for austenitic stainless steel that specifies its mechanical and physical properties, particularly in the annealed and cold-worked conditions, covering products like sheets, bars, and thin strips for applications that may include architectural uses.
ASTM A240 Equivalent Indian Standard
The equivalent Indian standards for ASTM A240 vary by grade, but a common equivalent is the IS 2062 grade which is often used for carbon steel and is sometimes used in place of ASTM A240 for certain grades. However, it's more accurate to compare specific grades, as there isn't a single direct replacement for all grades.
Examples of grade comparisons
ASTM A240 Grade 304: Equivalent to IS 2062 Grade 304
ASTM A240 Grade 316: Equivalent to IS 2062 Grade 316
ASTM A240 Grade 430: Equivalent to IS 2062 Grade 430
ASTM A240 Grade 409: Not a direct equivalent, but a comparable standard is IS 409
