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Home / Resources / ASTM A193

ASTM A193

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Alloy steel and stainless steel bolting materials for high temperature or high pressure service.

Scope – This specification is heavily utilized in petroleum and chemical construction applications and covers alloy steel and stainless steel bolting materials for high temperature or high pressure service. This specification is intended for use in pressure vessels, valves, flanges, and fittings.

Grades

B7 Alloy steel, AISI 4140/4142 quenched and tempered
B8 Class 1 Stainless steel, AISI 304, carbide solution treated.
B8M Class 1 Stainless steel, AISI 316, carbide solution treated.
B8 Class 2 Stainless steel, AISI 304, carbide solution treated, strain hardened
B8M Class 2 Stainless steel, AISI 316, carbide solution treated, strain hardened

Mechanical Properties

Grade Markings Size Tensile ksi, min Yield, ksi,
min
Elong, %, min RA % min Hardness Max
B7 B7 Up to 2-1/2 125 105 16 50 C35
2-5/8 – 4 115 95 16 50 C35
4-1/8 – 7 100 75 18 50 C35
B8 Class 1 B8 All 75 30 30 50 B96
B8M Class 1 B8M All 75 30 30 50 B96
B8 Class 2 B8SH Up to 3/4 125 100 12 35 C35
7/8 – 1 115 80 15 35 C35
1-1/8 – 1-1/4 105 65 20 35 C35
1-3/8 – 1-1/2 100 50 28 45 C35
B8M Class 2 B8MSH Up to 3/4 110 95 15 45 C35
7/8 – 1 100 80 20 45 C35
1-1/8 – 1-1/4 95 65 25 45 C35
1-3/8 – 1-1/2 90 50 30 45 C35

Chemical Properties

Element B7 (AISI 4140) B8 (AISI 304) B8M (AISI 316)
Carbon 0.37 – 0.49 0.08 max 0.08 max
Manganese 0.65 – 1.10 2.00 max 2.00 max
Phosphorus, max 0.035 0.045 0.045
Sulfur, max 0.040 0.030 0.030
Silicon 0.15 – 0.35 1.00 max 1.00 max
Chromium 0.75 – 1.20 18.0 – 20.0 16.0 – 18.0
Nickel 8.0 – 11.0 10.0 – 14.0
Molybdenum 0.15 – 0.25 2.00 – 3.00

Recommended
Mating Materials

Bolt Grade Nuts Spec/Grade Washers Spec/Grade
B7 A194 Grade 2H F436
B8 Class 1 A194 Grade 8 SS304
B8M Class 1 A194 Grade 8M SS316
B8 Class 2 A194 Grade 8 SS304
B8M Class 2 A194 Grade 8M SS316
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