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    ASTM A193/A193M Bolting Specification

    Alloy Steel & Stainless Steel Bolting for High Temperature or High Pressure Service

    Scope

    ASTM A193 / A193M specification covers alloy and ferritic and austenitic stainless steel bolting materials and bolting components for pressure vessels, valves, flanges, and fittings for high temperature or high pressure service, or other special purpose applications. Bolting Materials such as Bars and wire rods shall be hot wrought and 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. Bolting type such as Hex Bolts, Heavy Hex Bolts, Studs, Socket Head Cap Screws, Hex Cap Screws, Threaded Rods and Threaded Bars can be manufactured from ¼” to 4” in imperial and M6 to M100 in metric variants both fine threads and coarse threads. Bolting Components up to 6” can be provided at TorqBolt with the same certification. PED 2014/68/EC Certified ASTM/ASME A193/A193M Bolting is available exstock.

    ASTM A193/A193M Chemical Composition

    Ferritic Steels

    Grade Description and
    UNS Designation     		C Mn P S Si Cr Mo V Al
    ASTM A193 Grade B5 5% Cr 0.10 min 1.00 0.040 0.030 1.00 4.0-6.0 0.40-0.65 . . . . . .
    Product Analysis VariationB 0.01 0.03 0.005 0.005 0.05 0.10 0.05 . . . . . .
    ASTM A193 Grade B6, B6X 12% Cr (410), S41000 0.08-0.15 1.00 0.040 0.030 1.00 11.5-13.5 . . . . . . . . .
    Product Analysis VariationB 0.01 over 0.03 0.005 0.005 0.05 0.15 . . . . . . . . .
    ASTM A193 Grade B7, B7M Cr-MoC 0.38-0.48D 0.75-1.00 0.035 0.040 0.15-0.35 0.80-1.10 0.15-0.25 . . . . . .
    Product Analysis VariationB 0.02 0.04 0.005 0.005 0.02 0.05 0.02 . . . . . .
    ASTM A193 Grade B16 Cr-Mo-V 0.36-0.47 0.45-0.70 0.035 0.040 0.15-0.35 0.80-1.15 0.50-0.65 0.25-0.35 0.015E
    Product Analysis VariationB 0.02 0.03 0.005 0.005 0.02 0.05 0.03 0.03 . . .

    Austenitic Steels

    Grade Description and UNS Designatio Classes C Mn P S Si Cr Ni Mo Cu CbF Ti V N
    ASTM A193 Grade B8, B8A 304, S30400 1, 1A, 1D, 2 0.08 2.00 0.045 0.030 1.00 18.0-20.0 8.0-11.0 . . . . . . . . . . . . . . . . . .
    Product Analysis VariationB 0.01 0.04 0.010 0.005 0.05 0.20 0.15 . . . . . . . . . . . . . . . . . .
    ASTM A193 Grade B8C, B8CA 347, S34700 1, 1A, 1D, 2 0.08 2.00 0.045 0.030 1.00 17.0-19.0 9.0-12.0 . . . . . . 10 × C to 1.10 . . . . . . . . .
    Product Analysis VariationB 0.01 0.04 0.010 0.005 0.05 0.20 0.15 . . . . . . 0.05 under . . . . . . . . .
    ASTM A193 Grade B8M, B8MA, B8M2, B8M3 316, S31600 1, 1A, 1D, 2 0.08 2.00 0.045 0.030 1.00 16.0-18.0 10.0-14.0 2.00-3.00 . . . . . . . . . . . . . . .
    Product Analysis VariationB 0.01 0.04 0.010 0.005 0.05 0.20 0.15 0.10 . . . . . . . . . . . . . . .
    ASTM A193 Grade B8P, B8PA S30500 1, 1A, 1D, 2 0.12 2.00 0.045 0.030 1.00 17.0-19.0 11.0-13.0 . . . . . . . . . . . . . . . . . .
    Product Analysis VariationB 0.01 0.04 0.010 0.005 0.05 0.20 0.15 . . . . . . . . . . . . . . . . . .
    ASTM A193 Grade B8N, B8NA 304N, S30451 1A, 1B, 1D, 2 0.08 2.00 0.045 0.030 1.00 18.0-20.0 8.0-11.0 . . . . . . . . . . . . . . . 0.10-0.16
    Product Analysis VariationB 0.01 0.04 0.010 0.005 0.05 0.20 0.15 . . . . . . . . . . . . . . . 0.01
    ASTM A193 Grade B8MN, B8MNA 316N, S31651 1A, 1B, 1D, 2 0.08 2.00 0.045 0.030 1.00 16.0-18.0 10.0-13.0 2.00-3.00 . . . . . . . . . . . . 0.10-0.16
    Product Analysis VariationB 0.01 0.04 0.010 0.005 0.05 0.20 0.15 0.10 . . . . . . . . . . . . 0.01
    ASTM A193 Grade B8MLCuN, B8MLCuNA S31254 1A, 1B, 1D, 2 0.020 1.00 0.030 0.010 0.80 19.5-20.5 17.5-18.5 6.0-6.5 0.50-1.00 . . . . . . . . . 0.18-0.25
    Product Analysis VariationB 0.005 0.03 0.005 0.002 0.05 0.20 0.15 0.10 . . . . . . . . . . . . 0.02
    ASTM A193 Grade B8T, B8TA 321, S32100 1, 1A, 2 0.08 2.00 0.045 0.030 1.00 17.0-19.0 9.0-12.0 . . . . . . . . . 5 × (C + N) to 0.70 . . . 0.10
    Product Analysis VariationB 0.01 0.04 0.010 0.005 0.05 0.20 0.15 . . . . . . . . . 0.05 under . . . . . .
    ASTM A193 Grade B8R, B8RA S20910 1C, 1D 0.06 4.0-6.0 0.045 0.030 1.00 20.5-23.5 11.5-13.5 1.50-3.00 . . . 0.10-0.30 . . . 0.10-0.30 0.20-0.40
    Product Analysis VariationB 0.01 0.05 0.005 0.005 0.05 0.25 0.15 0.10 . . . 0.05 . . . 0.02 0.02
    ASTM A193 Grade B8S, B8SA S21800 1C, 1D 0.10 7.0-9.0 0.060 0.030 3.5-4.5 16.0-18.0 8.0-9.0 . . . . . . . . . . . . . . . 0.08-0.18
    Product Analysis VariationB 0.01 0.06 0.005 0.005 0.15 0.20 0.10 . . . . . . . . . . . . . . . 0.01
    ASTM A193 Grade B8LN, B8LNA S30453 1, 1A, 1D 0.030 2.00 0.045 0.030 1.00 18.0-20.0 8.0-11.0 . . . . . . . . . . . . . . . 0.10-0.16
    Product Analysis VariationB 0.005 0.04 0.010 0.005 0.05 0.20 0.15 . . . . . . . . . . . . . . . 0.01
    ASTM A193 Grade B8MLN, B8MLNA S31653 1, 1A, 1D 0.030 2.00 0.045 0.030 1.00 16.0-18.0 10.0-13.0 2.00-3.00 . . . . . . . . . . . . 0.10-0.16
    Product Analysis VariationB 0.005 0.04 0.010 0.005 0.05 0.20 0.15 0.10 . . . . . . . . . . . . 0.01
    ASTM A193 Grade B8CLN, B8CLNA 347LN, S34751 1, 1A, 1D 0.005-0.020 2.00 0.045 0.030 1.00 17.0-19.0 9.0-13.0 . . . . . . 0.20-0.50; 15 × carboncontent, min . . . . . . 0.06-0.10
    Product Analysis VariationB 0.002 under, 0.005 over 0.04 0.01 0.005 0.05 0.20 0.15 . . . . . . 0.05 . . . . . . 0.01
    ASTM A193 Grade B8CLNCuB, B8CLNCuBA S34752G 1, 1A, 1D 0.005-0.02 2.00 0.035 0.010 0.60 17.0-19.0 10.0-13.0 0.20-1.20 2.50-3.50 0.20-0.50; 15 × carboncontent, min . . . . . . 0.06-0.12
    Product Analysis VariationB 0.002 under, 0.005 over 0.04 0.01 0.005 0.05 0.20 0.15 . . . 0.15 0.05 . . . . . . 0.01
    ASTM A193 Grade B8ML4CuN, B8ML4CuNA S31730 1, 1A, 1D 0.030 2.00 0.040 0.010 1.00 17.0-19.0 15.0-16.5 3.0-4.0 4.0-5.0 . . . . . . . . . 0.045
    Product Analysis VariationB 0.005 0.04 0.005 0.002 0.05 0.20 0.15 0.10 0.15 . . . . . . . . . 0.01
    • (A) Values are maximums unless a range or a minimum is indicated. Where ellipses appear in this table, there is no requirement and the element need not be determined or reported. The intentional addition of Bi, Se, Te, and Pb is not permitted.
    • (B) Product Analysis-Individual determinations sometimes vary from the specified limits as shown in the tables. The several determinations of any individual element in a heat may not vary both above and below the specified range. Product variation limits are over for maximums, over or under for ranges, and under for minimums, unless otherwise indicated.
    • (C) Typical steel compositions used for this grade include 4140, 4142, 4145, 4140H, 4142H, and 4145H.
    • (D) For bar sizes over 31/2 in. [90 mm], inclusive, the carbon content may be 0.50% max. For the B7M grade, a minimum carbon of 0.28% is permitted, provided that the required tensile properties are met in the section sizes involved, the use of AISI 4130 or 4130H is allowed.
    • (E) Total of soluble and insoluble.
    • (F) Columbium and Niobium are alternate names for element 41 in the Periodic Table of the Elements.

    ASTM A193/A193M Mechanical Requirements

    Ferritic Steels (Inch)

    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, %Reduction of Area, min, % Hardness,
    max
    ASTM A193 Grade B5
    4 to 6 % Cr    		 up to 4, incl 1100 100 80 16 50 . . .
    ASTM A193 Grade B6
    13 % Cr    		 up to 4, incl 1100 110 85 15 50 . . .
    ASTM A193 Grade B6X
    13 % Cr    		 up to 4, incl 1100 90 70 16 50 26 HRC
    ASTM A193 Grade B7
    Cr-Mo    		 2 1⁄2 and under 1100 125 105 16 50 321 HBW or 35 HRC
    over 2 1⁄2 to 4 1100 115 95 16 50 321 HBW or 35 HRC
    over 4 to 7 1100 100 75 18 50 321 HBW or 35 HRC
    ASTM A193 Grade B7MA
    Cr-Mo     		4 and under 1150 100 80 18 50 235 HBW or 99 HRB
    over 4 to 7 1150 100 75 18 50 235 HBW or 99 HRB
    ASTM A193 Grade B16
    Cr-Mo-V    		 2 1⁄2 and under 1200 125 105 18 50 321 HBW or 35 HRC
    over 21⁄2 to 4 1200 110 95 17 45 321 HBW or 35 HRC
    over 4 to 8 1200 100 85 16 45 321 HBW or 35 HRC

    Austenitic Steels (Inch)

    Grade Diameter,
    in.     		Heat TreatmentB Tensile Strength,
    min, ksi     		Yield Strength, min,
    0.2 % offset, ks     		Elongation in 4 D,min Reduction of Area, min Hardness,
    max
    ASTM A193 Grade B8, B8M, B8P, B8LN, B8MLN, B8CLN Classes 1 and 1D All diameters carbide solution treated 75 30 30 50 223 HBW or 96 HRBC
    ASTM A193 Grade B8, B8CLNCuB Classes 1 and 1D; All diameters carbide solution treated 75 30 35 50 223 HBW or 96 HRBC
    ASTM A193 Grade B8ML4CuN Classes 1 and 1D All diameters carbide solution treated 70 25 35 50 90 HRB
    ASTM A193 Grade B8C, B8T Class 1 All diameters carbide solution treated 75 30 30 50 223 HBW or 96HRBC
    ASTM A193 Grade B8A, B8CA, B8CLNA, B8MA, B8PA, B8TA, B8LNA, B8MLNA, B8NA, B8MNA, B8MLCuNA Class 1A All diameters carbide solution treated in the finished condition 75 30 30 50 192 HBW or 90 HRB
    ASTM A193 Grade B8ML4CuNA Class 1A All diameters carbide solution treated 70 25 35 50 90 HRB
    ASTM A193 Grade B8N, B8MN, B8MLCuN Classes 1B and 1D All diameters carbide solution treated 80 35 30 40 223 HBW or 96 HRBC
    ASTM A193 Grade B8R Classes 1C and 1D All diameters carbide solution treated 100 55 35 55 271 HBW or 28 HRC
    ASTM A193 Grade B8RA Class 1C All diameters carbide solution treated in the finished condition 100 55 35 55 271 HBW or 28 HRC
    ASTM A193 Grade B8S Classes 1C and 1D All diameters carbide solution treated 95 50 35 55 271 HBW or 28 HRC
    ASTM A193 Grade B8SA Classes 1C All diameters carbide solution treated in the finished condition 95 50 35 55 271 HBW or 28 HRC
    ASTM A193 Grade B8, B8C, B8P, B8T, B8ND Class 2 3/4 and under carbide solution treated and strain hardened 125 100 12 35 321 HBW or 35 HRC
    over 3/4 to 1, incl 115 80 15 35 321 HBW or 35 HRC
    over 1 to 11/4 ,incl 105 65 20 35 321 HBW or 35 HRC
    over 11/4 to 11/2 ,incl 100 50 28 45 321 HBW or 35 HRC
    ASTM A193 Grade B8M, B8MN, B8MLCuND Class 2 3/4 and under carbide solution treated and strain hardened 110 95 15 45 321 HBW or 35 HRC
    over 3/4 to 1 incl 100 80 20 45 321 HBW or 35 HRC
    Over 1 to 11/4 ,incl 95 65 25 45 321 HBW or 35 HRC
    over 11/4 to 11/2 ,incl 90 50 30 45 321 HBW or 35 HRC
    ASTM A193 Grade B8, B8M2D Class 2B 2 and under carbide solution treated and strain hardened 95 75 25 40 321 HBW or 35 HRC
    over 2 to 21/2 incl 90 65 30 40 321 HBW or 35 HRC
    over 21/2 to 3 incl 80 55 30 40 321 HBW or 35 HRC
    ASTM A193 Grade B8M3DClass 2C 2 and under carbide solution treated and strain hardened 85 65 30 60 321 HBW or 35 HRC
    over 2 85 60 30 60 321 HBW or 35 HRC
    • (A) To meet the tensile requirements, the Brinell hardness shall be over 200 HBW (93 HRB).
    • (B) Class 1 is solution treated. Class 1A is solution treated in the finished condition for corrosion resistance; heat treatment is critical due to physical property requirement. Class 2 is solution treated and strain hardened. Austenitic steels in the strain-hardened condition may not show uniform properties throughout the section particularly in sizes over 3/4 in. in diameter.
    • (C) For sizes3/4 in. in diameter and smaller, a maximum hardness of 241 HBW (100 HRB) is permitted.
    • (D) For diameters 11/2 and over, center (core) properties may be lower than indicated by test reports which are based on values determined at1/2 radius.

    Ferritic Steels (Metric)

    Class Diameter,
    [mm]     		Min.Tempering
    Temp. °C     		Tensile Strength,
    min, MPa     		Yield Strength,min,
    .2% offset, MPa     		Elongation in 4D,
    min, %     		Reduction of Area, min, % Hardness,
    max
    ASTM A193M Grade B5
    4 to 6 % Cr     		up to M100, incl 593 690 550 16 50 . . .
    ASTM A193M Grade B6
    13 % Cr    		 up to M100, incl 593 760 585 15 50 . . .
    ASTM A193M Grade B6X
    13 % Cr    		 up to M100, incl 593 620 485 16 50 26 HRC
    ASTM A193M Grade B7
    Cr-Mo    		 M64 and under 593 860 720 16 50 321 HBW or 35 HRC
    over M64 to M100 593 795 655 16 50 321 HBW or 35 HRC
    over M100 to M180 593 690 515 18 50 321 HBW or 35 HRC
    ASTM A193M Grade B7MA
    Cr-Mo    		 M100 and under 620 690 550 18 50 235 HBW or 99 HRB
    over M100 to M180 620 690 515 18 50 235 HBW or 99 HRB
    ASTM A193M Grade B16
    Cr-Mo-V    		 M64 and under 650 860 725 18 50 321 HBW or 35 HRC
    over M64 to M100 650 760 655 17 45 321 HBW or 35 HRC
    over M100 to M200 650 690 585 16 45 321 HBW or 35 HRC

    Austenitic Steels (Metric)

    Grade Class ,
    mm     		Diameter Heat TreatmentB Tensile Strength,
    min,MPa     		Yield Strength, min,
    0.2 % offset, MPa     		Elongation in 4 D,min % Reduction of Area, min % Hardness,
    max
    ASTM A193M Grade B8, B8M, B8P, B8LN, B8MLN, B8CLN All diameters Classes 1 and 1D All diameters carbide solution treated 515 205 30 50 223 HBW or 96 HRBC
    ASTM A193M Grade B8CLNCuB All diameters Classes 1,1A,1D All diameters carbide solution treated 515 205 30 50 223 HBW or 96 HRBC
    ASTM A193M Grade B8ML4CuN All diameters Classes 1 and 1D All diameters carbide solution treated 480 175 35 50 90 HRB
    ASTM A193M Grade B8C, B8T All diameters Class 1 All diameters carbide solution treated 515 205 30 50 223 HBW or 96HRBC
    ASTM A193M Grade B8A, B8CA, B8CLNA, B8MA, B8PA, B8TA, B8LNA, B8MLNA, B8NA, B8MNA, B8MLCuNA All diameters Class 1A All diameters carbide solution treated in the finished condition 515 205 30 50 192 HBW or 90 HRB
    ASTM A193M Grade B8ML4CuNA All diameters Class 1A All diameters carbide solution treated 480 175 35 50 90 HRB
    ASTM A193M Grade B8N, B8MN, B8MLCuN All diameters Classes 1B and 1D All diameters carbide solution treated 550 240 30 40 223 HBW or 96 HRBC
    ASTM A193M Grade B8R All diameters Classes 1C and 1D All diameters carbide solution treated 690 380 35 55 271 HBW or 28 HRC
    ASTM A193M Grade B8RA All diameters Class 1C All diameters carbide solution treated in the finished condition 690 380 35 55 271 HBW or 28 HRC
    ASTM A193M Grade B8S All diameters Classes 1C and 1D All diameters carbide solution treated 655 345 35 55 271 HBW or 28 HRC
    ASTM A193M Grade B8SA All diameters Classes 1C All diameters carbide solution treated in the finished condition 655 345 35 55 271 HBW or 28 HRC
    ASTM A193M Grade B8, B8C, B8P, B8T, B8ND, Class 2 M20 and under carbide solution treated and strain hardened 860 690 12 35 321 HBW or 35 HRC
    over M20 to M24, incl 795 550 15 35 321 HBW or 35 HRC
    over M24 to M30, incl 725 450 20 35 321 HBW or 35 HRC
    over M30 to M36, incl 690 345 28 45 321 HBW or 35 HRC
    ASTM A193M Grade B8M, B8MN, B8MLCuND, Class 2 M20 and under carbide solution treated and strain hardened 760 655 15 45 321 HBW or 35 HRC
    over M20 to M24, incl 690 550 20 45 321 HBW or 35 HRC
    over M24 to M30, incl 655 450 25 45 321 HBW or 35 HRC
    over M30 to M36, incl 620 345 30 45 321 HBW or 35 HRC
    ASTM A193M Grade B8, B8M2D, Class 2B M48 and under carbide solution treated and strain hardened 655 515 25 40 321 HBW or 35 HRC
    over M48 to M64, incl 620 450 30 40 321 HBW or 35 HRC
    over M64 to M72, incl 550 380 30 40 321 HBW or 35 HRC
    ASTM A193M Grade B8M3D, Class 2C M48 and under carbide solution treated and strain hardened 585 450 30 60 321 HBW or 35 HRC
    over M48 585 415 30 60 321 HBW or 35 HRC
    • (A) To meet the tensile requirements, the Brinell hardness shall be over 200 HBW (93 HRB).
    • (B) Class 1 is solution treated. Class 1A is solution treated in the finished condition for corrosion resistance; heat treatment is critical due to physical property requirement. Class 2 is solution treated and strain hardened. Austenitic steels in the strain-hardened condition may not show uniform properties throughout the section particularly in sizes over M20 mm in diameter.
    • (C) For sizes M20 mm in diameter and smaller, a maximum hardness of 241 HBW (100 HRB) is permitted.
    • (D) For diameters M38 and over, center (core) properties may be lower than indicated by test reports which are based on values determined at1/2 radius.

    ASTM A193/A193M Bolting Components Marking

    Austenitic Steels

    Grade Class Grade Symbol
    ASTM A193 Grade B8 Class 1 TB B8
    ASTM A193 Grade B8C TB B8C
    ASTM A193 Grade B8M TB B8M
    ASTM A193 Grade B8P TB B8P
    ASTM A193 Grade B8T TB B8T
    ASTM A193 Grade B8LN TB B8F or TB B8LN
    ASTM A193 Grade B8MLN TB B8G or TB B8MLN
    ASTM A193 Grade B8CLN TB B8Y or TB B8CLN
    ASTM A193 Grade B8CLNCuB TB B8CLNCuB 
    ASTM A193 Grade B8ML4CuN TB B8YY or TB B8ML4CuN  
    ASTM A193 Grade B8A Class 1A TB B8A
    ASTM A193 Grade B8CA   TB B8TB B or TB B8CA
    ASTM A193 Grade B8MA   TB B8D or TB B8MA
    ASTM A193 Grade B8PA TB B8H or TB B8PA
    ASTM A193 Grade B8TA TB B8J or TB B8TA
    ASTM A193 Grade B8LNA TB B8L or TB B8LNA
    ASTM A193 Grade B8MLNA TB B8K or TB B8MLNA
    ASTM A193 Grade B8NA   TB B8V or TB B8MA
    ASTM A193 Grade B8MNA TB B8W or TB B8MNA
    ASTM A193 Grade B8MLCuNA TB B9K or TB B8MLCuNA  
    ASTM A193 Grade B8CLNA TB B8Z or TB B8CLNA
    ASTM A193 Grade B8CLNCuBA TB B8ZA or TB B8CLNCuBA
    ASTM A193 Grade B8ML4CuNA   TB B8ZZ or TB B8MLCuNA  
    ASTM A193 Grade B8N Class 1B TB B8N or TB B8Y
    ASTM A193 Grade B8MN TB B8MN or TB B9J
    ASTM A193 Grade B8MLCuN TB B8MLCuN
    ASTM A193 Grade B8R Class 1C TB B9A or TB B8R
    ASTM A193 Grade B8RA   TB B9TB B or TB B8RA
    ASTM A193 Grade B8S TB B9D or TB B8S
    ASTM A193 Grade B8SA   TB B9F or TB B8SA
    ASTM A193 Grade B8 Class 1D TB B94
    ASTM A193 Grade B8M TB B95
    ASTM A193 Grade B8P TB B96
    ASTM A193 Grade B8LN TB B97
    ASTM A193 Grade B8MLN TB B98
    ASTM A193 Grade B8N TB B99
    ASTM A193 Grade B8MN   TB B100
    ASTM A193 Grade B8R TB B101
    ASTM A193 Grade B8S TB B102
    ASTM A193 Grade B8CLN TB B103
    ASTM A193 Grade B8ML4CuN TB B104
    ASTM A193 Grade B8 Class 2 TB B8SH
    ASTM A193 Grade B8C TB B8CSH
    ASTM A193 Grade B8P TB B8PSH
    ASTM A193 Grade B8T TB B8TSH
    ASTM A193 Grade B8N TB B8NSH
    ASTM A193 Grade B8M TB B8MSH
    ASTM A193 Grade B8MN   TB B8YSH
    ASTM A193 Grade B8MLCuN TB B8JSH
    ASTM A193 Grade B8M2 Class 2B TB B9G or TB B8M2 TB B9
    ASTM A193 Grade B8M3   Class 2C TB B9H or TB B8M3

    Ferritic Steels

    Grade Grade Symbol
    ASTM A193 Grade B5 TB B5
    ASTM A193 Grade B6 TB B6
    ASTM A193 Grade B6X TB B6X
    ASTM A193 Grade B7 TB B7
    ASTM A193 Grade B7M TB B7M or B7M
    ASTM A193 Grade B16 TB B16
    ASTM A193 Grade B16+ Supplement S12 TB B16R

    In-Depth Engineering Reference

    How is ASTM A193 different from ASTM A320?

    ASTM A193 covers high-temperature bolting (B5, B6, B6X, B7, B7M, B8 family, B16) — typically rated from -29 °C up to 815 °C depending on grade. ASTM A320 covers the LOW-TEMPERATURE counterpart (L7, L43, L7M, etc.) for cryogenic service down to -101 °C. The two specifications share chemistry and processing concepts but diverge in heat treatment, Charpy impact requirements and intended service envelope.

    What is the SA-193 equivalent of ASTM A193?

    ASME Section II SA-193 is the boiler & pressure-vessel-code-adopted version of ASTM A193 — chemistry, mechanicals and heat treatment are identical. When a flange or pressure-vessel drawing references SA-193 B7, ASTM A193 B7 material with full ASME B&PV Code traceability is supplied.

    How are ASTM A193 grades organized?

    ASTM A193 grades split into TWO families: (1) Ferritic / alloy steels — B5 (5%Cr-Mo), B6/B6X (13%Cr martensitic), B7 (4140 Cr-Mo), B7M (NACE-compliant B7), B16 (1Cr-1Mo-¼V); (2) Austenitic stainless steels — B8 (304), B8M (316), B8C (347), B8T (321), B8P (305), B8R (Nitronic 50), B8S (Nitronic 60), B8N/B8MN/B8LN/B8MLN (nitrogen-enhanced variants), B8MLCuN/B8ML4CuN (super-austenitic 6-Mo). Each grade has Class 1, 1A, 1B, 1C, 1D, 2, 2B, or 2C sub-classes denoting heat-treatment condition.

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