ASTM A-193 CHEMICAL COMPOSITION

ASTM A-193 CHEMICAL COMPOSITION

Extremely common in the industrial piping world, this specification covers alloy and stainless steel bolting material for pressure vessels, valves, flanges, and fittings for high-temperature service. The term bolting material as used in this specification covers bars, bolts, screws, studs, stud bolts, and wire. Bars and wire shall be hot-wrought. The material may be further processed by center less grinding or by cold drawing. Austenitic stainless steel may be carbide solution treated or carbide solution treated and strain-hardened. Several grades are covered, including ferritic steels and austenitic stainless steels designated B5, B8, and so forth. Selection will depend upon design, service conditions,  mechanical properties, and high-temperature characteristics.

 

Type Ferritic Steels ASTM-193 CHEMICAL COMPOSITION

Identification

B5

 

B6 and B6X – S41000

Grade 5% Chromium (Type 501)   12% Chromium (Type 410)
Element

Range

Tolerance +/-

Range

Tolerance +/-

Carbon

.10 min

0.01 under

0.15 max

0.01 over

Manganese, max

1.00

0.03 under

1.00

0.03 over

Phosphorus, max

0.040

0.005 over

0.040

0.005 over

Sulfur, max

0.030

0.005 over

0.03

0.005 over

Silicon

1.00 max

0.05 over

1.00 max

0.05 over

Chromium

4.00 – 6.00

0.10

11.5 – 13.50

0.15

Molybdenum

0.40 – 0.65

0.05

Type Ferritic Steels

Identification

B7, B7M

 

B16

Grade Chromium – Molybdenum (C4140,4142,4145,4140 H, 4142 H, 4145H) Chromium – Molybdenum – Vanadium
Element

Range

Tolerance +/-

Range

Tolerance +/-

Carbon

0.37 – 0.49

0.02

0.36 – 0.44

0.02

Manganese

0.65 – 1.10

0.04

0.45 – 0.70

0.03

Phosphorus, max

0.035

0.005 over

0.035

0.005 over

Sulfur, max

0.040

0.005 over

0.040

0.005 over

Silicon

0.15 – 0.35

0.02

0.15 – 0.35

0.02

Chromium

0.75 – 1.20

0.05

0.8 – 1.15

0.05

Molybdenum

0.15 – 0.25

0.02

0.50 – 0.65

0.03

Vanadium

0.25 – 0.35

0.03

Aluminum, max%

0.015

Type Austentic Steels, Class 1, 1A, 1D, and 2

Identification

B8, B8A

 

B8C, B8CA

B8M, B8MA, B8M2, B8M3

  B8P, B8PA
Grade Unstabilized 18 chromium – 8 Nickel (Type 304 Stainless) Stabilized 18 Chromium- 8 Nickel (Type 347 Stainless) 18 Chromium- 10 Nickel- 2 Molybdenum (Type 316 Stainless) Unstabilized 18 Chromium – 8 Nickel (Type 305 Nickel)
Element

Range

Tolerance +/-

Range

Tolerance +/-

Range

Tolerance +/-

Range

Tolerance +/-

Carbon, max

0.08

0.01 over

0.08

0.01 over

0.08

0.01 over

0.12

0.01 over

Manganese, max

2.00

0.04 over

2.00

0.04 over

2.00

0.04 over

2.00

0.04 over

Phosphorus, max

0.045

0.010 over

0.045

0.010 over

0.045

0.010 over

0.045

0.010 over

Sulfur, max

0.030

0.005 over

0.030

0.005 over

0.030

0.005 over

0.030

0.005 over

Silicon

1.00

0.05 over

1.00

0.05 over

1.00

0.05 over

1.00

0.05 over

Chromium

18.00 – 20.00

0.20

17.00 – 19.00

0.20

16.00 – 18.00

0.20

17.00 – 19.00

.20

Nickel

8.00 – 10.50

0.15

9.00 – 13.00

0.15

10.00 – 14.00

0.15

11.00 – 13.00

0.15

Molybdenum

2.00 – 3.00

0.10

Columbium + Tantalum

10x carbon, min

0.05 under

Type Austentic Steels, Classes 1A, 1B, 1D and 2

Identification

B8N, B8NA

 

B8MN, B8MNA

B8MLCuN, B8MLCuNa

Grade (TYPE 304N) s 30451   (TYPE 316N) s 31651 S 31254
Element

Range

Tolerance +/-

Range

Tolerance +/-

Range

Carbon, max

0.08

0.01 over

0.08

0.01 over

0.020

Manganese, max

2.00

0.04 over

2.00

0.04 over

1.00

Phosphorus, max

0.045

0.010 over

0.045

0.010 over

0.030

Sulfur, max

0.030

0.005 over

0.030

0.005 over

0.010

Silicon, max

1.00

0.05 over

1.00

0.05 over

0.80

Chromium

18.00 – 20.00

0.20

16.00 – 18.00

0.20

19.5 – 20.5

Nickel

8.00 – 10.50

0.15

10.00 – 14.00

0.15

17.5 18.5

Molybdenum

2.00 – 3.00

0.10

6.0 6.5

Nitrogen

0.10 – 0.16

0.01

0.10 – 0.16

0.01

0.18 – 0.22

Copper

0.50 – 1.00

Type Austentic Steels, Classes 1, 1A, and2

Identification

B8T, B8TA

 
Grade Stabilized 18 Chromium – 8 Nickel (Type 321)
Element

Range

Tolerance +/-

Carbon, max

0.08

0.01 over

Manganese, max

2.00

0.04 over

Phosphorus, max

0.045

0.010 over

Sulfur, max

0.030

0.005 over

Silicon, max

1.00

0.05

Nickel

9.00 – 12.00

0.15

Chromium

17.00 – 19.00

0.20

Titanium

5 X CARBON, MIN

0.05 under

Type Austentic Steels, Classes 1C and 1D

Identification

B8R, B8RA

 

B8S, B8SA

Grade 22 Chromium – 13 Nickel – 5 Manganese 18 Chromium – 8 Nickel – 4 Silicon + Nitrogen
Element

Range

Tolerance +/-

Range

Tolerance +/-

Carbon, max

0.06

0.01  over

0.10

0.01 over

Manganese, max

4.00 – 6.00

0.05

7.00 – 9.00

0.06

Phosphorus, max

0.040

0.005 over

0.040

0.005 over

Sulfur, max

0.030

0.005 over

0.030

0.005 over

Silicon

1.00 MAX

0.05 over

3.5 – 4.5

0.15

Chromium

20.50 – 23.50

0.25

16.00 – 18.00

0.20

Nickel

11.50 – 13.50

0.15

8.00 – 9.00

0.10

Molybdenum

1.50 – 3.00

0.10

Nitrogen

0.20 – 0.40

0.02

0.08 – 0.18

0.01

Columbium + Tantalum

0.10 – 0.30

0.05

Vanadium

0.10 – 0.30

0.02

Type Austentic Steels, Classes 1, 1A, and 1D
Identification

B8LN, B8LNA

 

B8MLN, B8MLNA

Grade TYPE 304N WITH RESTRICTED CARBON TYPE 316N WITH RESTRICTED CARBON
Element

Range

Tolerance +/-

Range

Tolerance +/-

Carbon, max

0.030

0.005 over

0.030

0.005 over

Manganese, max

2.00

0.04 over

2.00

0.04 over

Phosphorus, max

0.045

0.010 over

0.045

0.010 over

Sulfur, max

0.030

0.005 over

0.030

0.005 over

Silicon

1.00

0.05 over

1.00

0.05 over

Chromium

18.00 – 20.00

0.20

16.00 – 18.00

0.20

Nickel

8.00 – 10.50

0.15

10.00 – 14.00

0.15

Molybdenum

2.00 – 3.00

.10

Nitrogen

0.10 – 0.16

0.01

0.10 – 0.16

0.01

CALL: 225-272-6200 24/7

Lightning Bolt & Supply, INc

CALL: 225-272-6200 24/7