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ASTM A53
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A350 LF2
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 A193 B7
A194 2H
A240 GR.410
A312 S31726

A193 B7 

ASTM A193 Standard Specification for Alloy-Steel and Stainless Steel Bolting Materials for High-Temperature Service

 

Grade: B7 -- Ferritic Steels / Chromium-Molybdenum

 

Chemical Requirements (Composition, percent) 

C: 0.38-0.48

Mn: 0.75-1.00

P: 0.035

S: 0.040

Si: 0.15-0.35

Cr: 0.80-1.10

Mo: 0.15-0.25

*For bar sizes over 3-1/2 in. [90 mm], inclusive, the carbon content may be 0.50 %, max.

 

Mechanical Requirements —Metric Products

Diameter, [mm]

Tensile Strength,

min,MPa

Yield Strength,

min, 0.2 % offset, MPa

Elongation

in 4D, min, %

Reduction of Area,

min, %

Hardness,

max

M64 and under

860

720

16

50

321 HB or 35 HRC

over M64 to M100

795

655

16

50

321 HB or 35 HRC

over M100 to M180

690

515

18

50

321 HB or 35 HRC

 

Minimum Tempering Temperature: 593


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