Astm A193 B7 486b4n

ASTM A193 B7 (Cr- Mo AISI 4140,4142,4145 ) This material is considered as the most suitable for bolts to be used at temperature below 450 °. C, with a minimum effect on its structural strength during application at a high temperature. The material has the following chemical properties and physical Characteristics. C

Mn

P

S

Si

Cr

Mo

0.37-0.49

0.65-1.10

0.035 Max

0.04 Max

0.15-0.35

0.75-1.20

0.15-0.25

Dia

Minimum Tempering Temperature (°F)

Tensile Strength min, ksi ( MPa)

Reduction of Area min %

Hardness max

21/2" and under

1,100 (593 ° C )

125(860)

105(720)

16

50

321HB or 35 HRc

over 21/2" to 4"

1,100 (593 ° C )

115(795)

95(655)

16

50

302HB or 35 HRc

over 4" to 7"

1,100 (593 ° C )

100(690)

75(515)

18

50

277HB or 29 HRc

Yield Strength. min, Elongation in 0.2% offset, 4D Ksi min % ( MPa)

ASTM A194 Gr.2H This is the material for bolts made from ASTM A-193 B7, considered to be used with suitable heat treatment. The chemical properties and physical characteristics are as follows: C

0.40 Min

Mn

1.00 Max

P

0.040 Max

S

Si

0.050 Max

0.40 Max

Brinell Hardness

Rockwell Hardness

To 11/2" incl 248 to 352

24 to 38 HRC

Over 11/2",212 to 352

38 HRC Max

ASTM A307 This material is suitable in structural application where nominal strength alongwith weldability is required. Yield Strength. min, Elongation in 0.2% offset, 2" Ksi min % (MPa)

Grade

P

S

Tensile Strength min, ksi (MPa)

A

0.06 Max

0.15 Max

60 (415)

-

18

121 - 241 BHN

B

0.04 Max

0.05 Max

60 - 100 (415 - 690)

-

18

121 - 212 BHN

C

-

-

58 - 80 (400 - 550)

36(50)

23

Not Required

Hardness max