ASTM A193 B7(Bolt)

Astm-A193-B7

Chemical Requirements (Composition & Percent)
Ferritic Steels
Grade B5 B6 and B6X
Description 5% Chromium 12% Chromium
UNS Designation S41000 (410)
Range Product Variation, Over or Under Range Product Variation, Over or Under
Carbon 0.10 min 0.01 under 0.08–0.15 0.01 over
Manganese (max) 1.00 0.03 over 1.00 0.03 over
Phosphorus, max 0.040 0.005 over 0.040 0.005 over
Sulfur, max 0.030 0.005 over 0.030 0.005 over
Silicon 1.00 max 0.05 over 1.00 max 0.05 over
Chromium 4.0–6.0 0.10 11.5–13.5 0.15
Molybdenum 0.40–0.65 0.05 --- ---
Ferritic Steels
Grade B7, B7M B16
Description Chromium-Molybdenum Chromium-Molybdenum-Vanadium
Range Product Variation, Over or Under Range Product Variation, Over or Under
Carbon 0.37–0.49 0.02 0.36–0.47 0.02
Manganese (max) 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 0.80–1.15 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 ---
Chemical Requirements (Composition & Percent)
Austenitic Steels, Classes 1, 1A, 1D, and 2
Grade B8, B8A B8C, B8CA B8M, B8MA, B8M2, B8M3 B8P, B8PA
UNS Designation S30400 (304) S34700 (347) S31600 (316) S30500
Range Product Variation, Over or Under Range Product Variation, Over or Under Range Product Variation, Over or Under Range Product Variation, Over or Under
Carbon 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 (max) 1.00 0.05 over 1.00 0.05 over 1.00 0.05 over 1.00 0.05 over
Chromium 18.0–20.0 0.20 17.0–19.0 0.20 16.0–18.0 0.20 17.0–19.0 0.20
Nickel 8.0–11.0 0.15 9.0–12.0 0.15 10.0–14.0 0.15 11.0–13.0 0.15
Molybdenum --- --- --- --- 2.00–3.00 0.10 --- ---
Columbium + --- --- 10 x carbon content, min; 1.10 max 0.05 under --- --- --- ---
tantalum
Austenitic Steels, Classes 1A, 1B, 1D, and 2
Grade B8N, B8NA B8MN, B8MNA B8MLCuN, B8MLCuNA
Description S30451 (304N) S31651 (316N) S31254
Range Product Variation, Over or Under Range Product Variation, Over or Under Range Product Variation, Over or Under
Carbon 0.08 0.01 over 0.08 0.01 over 0.020 0.005 over
Manganese (max) 2.00 0.010 over 2.00 0.04 over 1.00 0.03 over
Phosphorus, (max) 0.045 0.005 over 0.045 0.010 over 0.030 0.005 over
Sulfur, (max) 0.030 0.05 over 0.030 0.005 over 0.010 0.002 over
Silicon, (max) 1.00 0.05 over 1.00 0.05 over 0.80 0.05 over
Chromium 18.0–20.0 0.20 16.0–18.0 0.20 19.5–20.5 0.20
Nickel 8.0–11.0 0.15 10.0–13.0 0.15 17.5–18.5 0.15
Molybdenum --- --- 0.10–0.16 0.10 6.0–6.5 0.10
Nitrogen 0.10–0.16 0.01 0.10–0.16 0.01 0.18–0.22 0.02
Copper --- --- --- --- 0.50–1.00 ---
Chemical Requirements (Composition & Percent)
Type Austenitic Steels, Classes 1, 1A, and 2
Grade B8T, B8TA
UNS Designation S32100 (321)
Range Product Variation, Over or Under
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 over
Chromium 17.0–19.0 0.20
Nickel 9.0–12.0 0.15
Titanium 5 x (C + N) min, 0.70 max 0.05 under
Nitrogen 0.10 max ---
Type Austenitic Steels, Classes 1C, and 1D
Grade B8T, B8TA
UNS Designation S32100 (321)
Range Product Variation, Over or Under Range Product Variation, Over or Under
Carbon 0.06 0.01 over 0.10 0.01 over
Manganese (max) 4.0–6.0 0.05 7.0–9.0 0.06
Phosphorus, (max) 0.045 0.005 over 0.060 0.005 over
Sulfur, (max) 0.030 0.005 over 0.030 0.005 over
Silicon, (max) 1.00 max 0.05 over 3.5–4.5 0.15
Chromium 20.5–23.5 0.25 16.0–18.0 0.20
Nickel 11.5–13.5 0.15 8.0–9.0 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 Austenitic Steels, Classes 1C, and 1D
Grade B8T, B8TA
UNS Designation S32100 (321)
Range Product Variation, Over or Under Range Product Variation, Over or Under
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 0.04 over 0.045 0.010 over
Sulfur, (max) 0.030 0.005 over 0.030 0.005 over
Silicon, (max) 1.00 0.05 over 1.00 0.05 over
Chromium 18.0–20.0 0.20 16.0–18.0 16.0–18.0
Nickel 8.0–11.0 0.15 10.0–13.0 0.15
Molybdenum --- --- 2.00–3.00 0.10
Nitrogen 0.10–0.16 0.01 0.10–0.16 0.01
Mechanical Requirements — Inch Products
Ferritic Steels
Grade Diameter, in. Minimum Tempering Temperature, °F Tensile Strength (min, ksi) Yield Strength, min, 0.2 % offset (ksi) Elongation in 4D (min, %) Reduction of Area (min, %) Hardness ( max)
B5 4 to 6 % chromium up to 4, incl 1,100 100 80 16 50 ---
B6 13 % chromium up to 4, incl 1,100 110 85 15 50 ---
B6X 13 % chromium up to 4, incl 1,100 90 70 16 50 26 HRC
B7 Chromium-molybdenum 2-1/2 and under 1,100 125 105 16 50 321 HB or 35 HRC
over 2-1/2 to 4 1,100 115 95 16 50 321 HB or 35 HRC
over 4 to 7 1,100 100 75 18 50 321 HB or 35 HRC
B7M Chromium-molybdenum 4 and under 1,150 100 80 18 50 235 HB or 99 HRB
over 4 to 7 1,150 100 75 18 50 235 HB or 99 HRB
B16 Chromium-molybdenum-vanadium 2-1/2 and under 1,200 125 105 18 50 321 HB or 35 HRC
over 21⁄2 to 4 1,200 110 95 17 45 321 HB or 35 HRC
over 4 to 8 1,200 100 85 16 45 321 HB or 35 HRC
Austenitic Steels
Grade & Diameter, in. Heat Treatment Tensile Strength (min, ksi) Yield Strength, min, 0.2 % offset (ksi) Elongation in 4D (min, %) Reduction of Area (min, %) Hardness ( max)
Classes 1 and 1D; B8, B8M, B8P, B8LN, B8MLN, all diameters carbide solution treated 75 30 30 50 223 HB or 96 HRBC
Class 1: B8C, B8T, all diameters carbide solution treated 75 30 30 50 223 HB or 96HRBC
Class 1A: B8A, B8CA, B8MA, B8PA, B8TA, B8LNA, B8MLNA, B8NA, B8MNA, B8MLCuNA, all diameters carbide solution treated in the finished condition 75 30 30 50 192 HB or 90 HRB
Classes 1B and 1D: B8N, B8MN, B8MLCuN, all diameters carbide solution treated 80 35 30 40 223 HB or 96 HRBC
Classes 1C and 1D: B8R, all diameters carbide solution treated 100 55 35 55 271 HB or 28 HRC
Class 1C: B8RA, all diameters carbide solution treated in the finished condition 100 55 35 55 271 HB or 28 HRC
Classes 1C and 1D: B8S, all diameters carbide solution treated 95 50 35 55 271 HB or 28 HRC
Classes 1C: B8SA, all diameters carbide solution treated in the finished condition 95 50 35 55 271 HB or 28 HRC
Class 2: B8, B8C, B8P, B8T, B8N, carbide solution treated and strain hardened 125 100 12 35 321 HB or 35 HRC
3/4 and under
over 3/4 to 1, incl 115 80 15 35 321 HB or 35 HRC
over 1 to 1-1/4 , incl 105 65 20 35 321 HB or 35 HRC
over 1-1/4 to 1-1/2 , incl 100 50 28 45 321 HB or 35 HRC
Class 2: B8M, B8MN, B8MLCuN carbide solution treated and strain hardened 110 95 15 45 321 HB or 35 HRC
3/4 and under
over 3/4 to 1 incl 100 80 20 45 321 HB or 35 HRC
Over 1 to 1-1/4 , incl 95 65 25 45 321 HB or 35 HRC
over 1-1/4 to 1-1/2 , incl 90 50 30 45 321 HB or 35 HRC
Class 2B: B8, B8M2 carbide solution treated and strain hardened 95 75 25 40 321 HB or 35 HRC
2 and under
over 2 to 2-1/2 incl 90 65 30 40 321 HB or 35 HRC
Austenitic Steels
Grade & Diameter, in. Heat Treatment Tensile Strength (min, ksi) Yield Strength, min, 0.2 % offset (ksi) Elongation in 4D (min, %) Reduction of Area (min, %) Hardness ( max)
over 21⁄2 to 3 incl carbide solution treated and strain hardened 80 55 30 40 321 HB or 35 HRC
Class 2C: B8M3D 85 65 30 60 321 HB or 35 HRC
2 and under
over 2 85 60 30 60 321 HB or 35 HRC
Mechanical Requirements — Metric Products
Ferritic Steels
Grade Diameter, in. 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)
B5 4 to 6 % chromium up to M100, incl 593 690 550 16 50 ---
B6 13 % chromium up to M100, incl 593 760 585 15 50 ---
B6X 13 % chromium up to M100, incl 593 620 485 16 50 26 HRC
B7 Chromium-molybdenum M64 and under 593 860 720 16 50 321 HB or 35 HRC
over M64 to M100 593 795 655 16 50 321 HB or 35 HRC
over M100 to M180 593 690 515 18 50 321 HB or 35 HRC
B7M 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
B16 Chromium-molybdenum-vanadium M64 and under 650 860 725 18 50 321 HB or 35 HRC
over M64 to M100 650 760 655 17 45 321 HB or 35 HRC
over M100 to M180 650 690 585 16 45 321 HB or 35 HRC
Austenitic Steels
Grade & Diameter, in. Heat Treatment Tensile Strength (min, Mpa) Yield Strength, min, 0.2 % offset (Mpa) Elongation in 4D (min, %) Reduction of Area (min, %) Hardness ( max)
Classes 1 and 1D; B8, B8M, B8P, B8LN, B8MLN, all diameters carbide solution treated 515 205 30 50 223 HB or 96 HRBC
Class 1: B8C, B8T, all diameters carbide solution treated 515 205 30 50 223 HB or 96HRBC
Class 1A: B8A, B8CA, B8MA, B8PA, B8TA, B8LNA, B8MLNA, B8NA, B8MNA, B8MLCuNA, all diameters carbide solution treated in the finished condition 515 205 30 50 192 HB or 90 HRB
Classes 1B and 1D: B8N, B8MN, B8MLCuN, all diameters carbide solution treated 550 240 30 40 223 HB or 96 HRBC
Classes 1C and 1D: B8R, all diameters carbide solution treated 690 380 35 55 271 HB or 28 HRC
Class 1C: B8RA, all diameters carbide solution treated in the finished condition 690 380 35 55 271 HB or 28 HRC
Classes 1C and 1D: B8S, all diameters carbide solution treated 655 345 35 55 271 HB or 28 HRC
Classes 1C: B8SA carbide solution treated in the finished condition 655 345 35 55 271 HB or 28 HRC
Austenitic Steels
Grade & Diameter, in. Heat Treatment Tensile Strength (min, Mpa) Yield Strength, min, 0.2 % offset (Mpa) Elongation in 4D (min, %) Reduction of Area (min, %) Hardness ( max)
all diameters condition
Class 2: B8, B8C, B8P, B8T, B8N carbide solution treated and strain hardened 860 690 12 35 321 HB or 35 HRC
M20 and under
over M20 to M24, incl 795 550 15 35 321 HB or 35 HRC
over M24 to M30, incl 725 450 20 35 321 HB or 35 HRC
over M30 to M36, incl 690 345 28 45 321 HB or 35 HRC
Class 2: B8M, B8MN, B8MLCuN carbide solution treated and strain hardened 760 655 15 45 321 HB or 35 HRC
M20 and under 321 HB or 35 HRC
over M20 to M24, incl 690 550 20 45 321 HB or 35 HRC
over M24 to M30, incl 655 450 25 45 321 HB or 35 HRC
over M30 to M36, incl 620 345 30 40 321 HB or 35 HRC
Class 2B: B8, B8M2 carbide solution treated and strain hardened 655 515 25 40 321 HB or 35 HRC
M48 and under 321 HB or 35 HRC
over M48 to M64, incl 620 450 30 40 321 HB or 35 HRC
over M64 to M72, incl 550 380 30 40 321 HB or 35 HRC
Class 2C: B8M3 carbide solution treated and strain hardened 585 450 30 60 321 HB or 35 HRC
M48 and under 321 HB or 35 HRC
over M48 585 415 30 60 321 HB or 35 HRC
Marking of Ferritic Steels
Grade Marking Symbol
B5 B5
B6 B6
B6X B6X
B7 B7
B7M B7M
B16 B16
B16+ B16R
Supplement S12
Marking of Austenitic Steels
Class Grade Marking Symbol
Class 1 B8 B8
B8C B8C
B8M B8M
B8P B8P
B8T B8T
B8LN B8F or B8LN
B8MLN B8G or B8MLN
Class 2 B8A B8A
B8CA B8B or B8CA
B8MA B8D or B8MA
B8PA B8H or B8PA
B8TA B8J or B8TA
B8LNA B8L or B8LNA
B8MLNA B8K or B8MLNA
B8NA B8V or B8MA
B8MNA B8W or B8MNA
B8MLCuNA B9K or B8MLCuNA
Class 1B B8N B8N
B8MN B8Y or B8MN
B8MLCuN B9J or B8MLCuN
Class 1C B8R B9A or B8R
B8RA B9B or B8RA
B8S B9D or B8S
B8SA B9F or B8SA
Class 1D B8 B94
B8M B95
B8P B96
B8LN B97
B8MLN B98
B8N B99
B8MN B100
B8R B101
B8S B102
Class 2 B8 B8SH
B8C B8CSH
B8P B8PSH
B8T B8TSH
B8N B8NSH
B8M B8MSH
B8MN B8YSH
B8MLCuN B0JSH
Class 2B B8M2 B9G or B8M2
B8 B9
Class 2C B8M3 B9H or B8M3