Marking Symbol

Grade of Bolting

B7/L7

B16

B8 Class 1

BB8M Class 1

Service Conditions^t

Min:-100 Deg C Max 400 Deg C

Min: 0 Deg C Max: 520 Deg C

Min: -250 Deg C Max: 575 Deg C

Min: -250 Deg C Max: 600 Deg C

Material Specifications

ASTM-193/A193M

AISI 4140

ASTM-A193/193M

Chrome-Moly-Vandium

ASTM-A193/A193M

AISI Type 304

ASTM-A193/A193M

AISI Type 316

Chemical Composition

Carbon

0.37-0.49

0.36-0.47

0.08 Max

0.08 Max

Silicon

0.15-0.35

0.15-0.35

1.00 Max

1.00 Max

Manganese

0.65-1.10

0.45-0.70

2.00 Max

2.00 Max

Nickel

-

-

8.00-10.50

10.00-14.00

Chromium

0.75-1.20

0.80-1.15

18.00-20.00

16.00-18.00

Molybdenum

0.15-0.25

0.50-0.65

-

2.00-3.00

Vandium

-

0.25-0.35

-

-

Sulphur

0.040 Max

0.040 Max

0.030 Max

0.030 Max

Phosphorus

0.035 Max

0.035 Max

0.045 Max

0.045 Max

Mechanical Properties

Limiting Ruling Selection

2 1/2 and under

2 1/2" and under

-

-

Minimum Tensile Strength

860 MPA

860 MPA

515 MPA

515 MPA

Yield Strength

Min 0.2% Offset

720 MPA (725 MPA for L7)

725 MPA

205 MPA

205 MPA

Minimum Eongational in 4D%

16

18

30

30

Minimum Reduction of Area%

50

50

50

50

Brinell Harness

-

-

223HB or 96HRB

223HB or 96HRB