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ASTM A193
Rods Specification-NINGBO BOLT |
ASTM A193 Rods Specification
ASTM A193 Specification for high tensile alloy and stainless steel bolts
including most popular grade B5, B6, B7, B7M, B8, B8M, B8T, B16, etc.
ASTM A193 specification
covers high tensile alloy and stainless steel fasteners for pressure vessels,
valves, flanges, and fittings for high temperature or high pressure service, or
other special purpose bolting applications. Several grades are covered,
including ferritic steels and austenitic stainless steels designated B5, B6, B7,
B8, B8M, etc. Selection will depend upon design, service conditions, mechanical
properties, and high temperature characteristics. This specification is
expressed in both inch-pound units and in SI units; however, unless the purchase
order or contract specifies the applicable A193M specification designation (SI
units), the inch-pound units shall apply.
Bolt Grades
|
Bolt Grade |
Raw Material |
|
B5 |
5% Chromium
Ferritic Steel |
|
B6 |
13%
Chromium Ferritic Steel |
|
B7 |
Chromium
Molybdenum Alloy Steel, Quenched & Tempered |
|
B7M |
Chromium
Molybdenum Alloy Steel, Quenched & Tempered |
|
B16 |
Chromium-molybdenum-vanadium Alloy Steel, Quenched & Tempered |
|
B8 |
AISI 304
Stainless Steel, Carbide Solution Treated |
|
B8 Class 2 |
AISI 304
Stainless Steel, Carbide Solution Treated and Strain Hardened |
|
B8M |
AISI 316
Stainless Steel, Carbide Solution Treated |
|
B8M Class 2 |
AISI 316
Stainless Steel, Carbide Solution Treated and Strain Hardened |
|
B8T |
AISI 321
Stainless Steel, Carbide Solution Treated |
|
B8T Class 2 |
AISI 321
Stainless Steel, Carbide Solution Treated and Strain Hardened |
Chemical Composition
|
Element |
Grade B5 |
Grade B6 |
Grade B7, 7M |
Grade B16 |
Grade B8 |
Grade B8M |
Grade B8T |
|
Carbon |
0.10 min |
0.08-0.15 |
0.37-0.49 |
0.36-0.47 |
0.08 |
0.08 |
0.10 min |
|
Manganese,
max |
1.00 |
1.00 |
0.65-1.10 |
0.45-0.70 |
2.00 |
2.00 |
1.00 |
|
Phosphorus,
max |
0.040 |
0.040 |
0.035 |
0.035 |
0.045 |
0.045 |
0.040 |
|
Sulfur, max |
0.003 |
0.030 |
0.040 |
0.040 |
0.030 |
0.030 |
0.030 |
|
Silicon |
1.00 |
1.00 max |
0.15-0.35 |
0.15-0.35 |
1.00 |
1.00 |
1.00 max |
|
Chromium |
4.0-6.0 |
11.5-13.5 |
0.75-1.20 |
0.80-1.15 |
18.0-20.0 |
16.0-18.0 |
4.00-6.00 |
|
Molybdenum |
0.40-0.65 |
-- |
0.15-0.25 |
0.50-0.65 |
-- |
2.00-3.00 |
0.40-0.65 |
|
Vanadium |
-- |
-- |
-- |
0.25-0.35 |
-- |
-- |
-- |
|
Aluminium,
max |
-- |
-- |
-- |
0.015 |
-- |
-- |
-- |
Mechanical Properties
|
Bolt Grade |
Diameter,
in. |
Tensile
Strength, ksi |
Yield
Strength ksi |
Elongation, % |
Reduction,
% |
Hardness |
|
B5 |
Up to 4,
inclusive |
100 |
80 |
16 |
50 |
-- |
|
B6 |
Up to 4,
inclusive |
110 |
85 |
15 |
50 |
-- |
|
B7 |
2.5 and
under |
125 |
105 |
16 |
50 |
321 HBW or
35 HRC |
|
Over 2.5 to
4 |
115 |
95 |
16 |
50 |
321 HBW or
35 HRC |
|
Over 4 to 7 |
100 |
75 |
18 |
50 |
321 HBW or
35 HRC |
|
B7M |
4 and under |
100 |
80 |
18 |
50 |
235 HBW or
99 HRB |
|
over 4 to 7 |
100 |
75 |
18 |
50 |
235 HBW or
99 HRB |
|
B16 |
2.5 and
under |
125 |
105 |
18 |
50 |
321 HBW or
35 HRC |
|
Over 2.5 to
4 |
110 |
95 |
17 |
45 |
321 HBW or
35 HRC |
|
Over 4 to 8 |
100 |
85 |
16 |
45 |
321 HBW or
35 HRC |
|
B8, B8M,
Class 1 |
All
Diameters |
75 |
30 |
30 |
50 |
223 HBW or
96 HRB |
|
B8, B8T,
Class 2 |
3/4 and
under |
125 |
100 |
12 |
35 |
321 HBW or
35 HRC |
|
Over 3/4 to
1, inclusive |
115 |
80 |
20 |
45 |
321 HBW or
35 HRC |
|
Over 1 to 1
1/4, inclusive |
105 |
65 |
25 |
45 |
321 HBW or
35 HRC |
|
Over 1 1/4
to 1 1/2, inclusive |
100 |
50 |
30 |
45 |
321 HBW or
35 HRC |
|
B8M, Class
2 |
3/4 and
under |
110 |
95 |
15 |
45 |
321 HBW or
35 HRC |
|
over 3/4 to
1, inclusive |
100 |
80 |
20 |
45 |
321 HBW or
35 HRC |
|
over 1 to 1
1/4, inclusive |
95 |
65 |
25 |
45 |
321 HBW or
35 HRC |
|
M30 to M36,
inclusive |
620 |
345 |
30 |
45 |
321 HBW or
35 HRC |
Recommended Nuts & Washers
|
Bolt
Specification |
Nut
Specification |
Washer
Specification |
|
ASTM A193
Grade B5 |
ASTM A194
Grade 3 |
ASTM A36
Mild Steel |
|
ASTM A193
Grade B6 |
ASTM A194
Grade 6 |
ASTM A240
Grade 410 |
|
ASTM A193
Grade B7 |
ASTM A194
Grade 2H |
ASTM F436
Type 1 |
|
ASTM A193
Grade B7M |
ASTM A194
Grade 2HM |
ASTM F436
Type 1 |
|
ASTM A193
Grade B16 |
ASTM A194
Grade 16 |
ASTM F436
Type 1 |
|
ASTM A193
Grade B8 |
ASTM A194
Grade 8 |
ASTM A240
Grade 304 |
|
ASTM A193
Grade B8M |
ASTM A194
Grade 8M |
ASTM A240
Grade 316 |
|
ASTM A193
Grade B8T |
ASTM A194
Grade 8T |
ASTM A240
Grade 321 |
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