ASTM A240 Specification

ASTM A240 Specification for Stainless Steel Plates, Sheets and Strips used as parent material for manufacturing Flat Washers.

ASTM A240 specification covers stainless steel plates, sheets and strips for pressure vessels and general applications. This specification covers chemical composition and mechanical properties for various grades of ferritic, austenitic, martensitic, duplex, super duplex and high moly stainless steel alloys. Boltport frequently uses sheets and plates of 304, 304l, 316, 316l, 321, 347, 309, 310, 316Ti, 317L, Xm-19, 904L, 409, 410, 430, Duplex S31803, S32205, Super Duplex S32750, S32760, S32550, High moly UNS S31254, Alloy 20, etc., conforming to ASTM A240 specification for manufacturing sheet metal washers for bolting assemblies.

(For Metric Units, please visit ASTM A240M Specification)

Grades

Type Raw Material
304 18-8 Chromium Nickel Austenitic Stainless Steel
316L Low Carbon, Chromium Nickel Molybdenum Austenitic Stainless Steel
321 Titanium Stabalized 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

(For all grades, please visit ASTM A240 Grades)

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 ... ... ... ... ...

Mechanical Properties

Type Tensile Strength, ksi,
min
Yield Strength, ksi,
min
Elongation, %
min
Hardness,
maxA
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