Stud bolts A 193 Grades

Stud bolts A 193 Grades

[ AREAS-960 ]

This Grade B7M is heavily utilized in petroleum, Sewage, Water treatment and chemical construction applications. The ASTM standardcovers alloy steel and stainless steel bolting materials for high temperature or high-pressure service. This specification includes fasteners intended for use in pressure vessels, valves, flanges, and fittings. Although, this material is often available in national coarse (UNC) thread pitches, if being used in traditional applications, threads are specified 8 threads per inch (tpi) for diameters above one inch.

ASTM A193 Grade B7M Chemical properties

Property class 

Chemical composition

C.

Mn.

Si.

P.

S.

Cr.

Ni.

Mo.

V.

Ti.

B7M

0.37---0.49

0.65---1.10

0.15---0.35

0.035 max.

0.04 max.

0.75---1.20

--- 

0.15---0.25

--- 

--- 

ASTM A193 Grade B7M Mechanical properties Inch Product

Class 

Diameter, [Inch] 

Minimum Tempering Temperature, °C 

Tensile Strength, min, MPa

Yield Strength, min, 0.2 % offset, MPa

Elongation in 4D, min, % 

Reduction of Area, min, % 

Hardness, max 

B7MA Chromium-molybdenum 

4 and under

1150

100

80

18

50

235 HB or 99 HRB

over 4 to 7

1150

100

75

18

50

235 HB or 99 HRB

ASTM A193 Grade B7M Mechanical properties Metric Product

Class 

Diameter, [mm] 

Minimum Tempering Temperature, °C 

Tensile Strength, min, MPa

Yield Strength, min, 0.2 % offset, MPa

Elongation in 4D, min, % 

Reduction of Area, min, % 

Hardness, max 

B7MA Chromium-molybdenum 

M100 and under

620

690

550

18

50

235 HB or 99 HRB

over M100 to M180 

620

690

515

18

50

235 HB or 99 HRB


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