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Ningbo Long I Metal Industry Co.,Ltd.
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You are in: HOME > Technical Information > Mechanical Property and Chemical Requirements (Composition) > ASTM A 320/A320M Alloy Steel Bolting Materials for Low Temperature Service |
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| ASTM A 320/A320M TABLE 3 Chemical Requirements (Composition, percent) |
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Type
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Ferritic Steels
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Austenitic Steels, Class 1,1A and 2
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Identification Symbol
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L7,L7M
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B8, B8A
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B8T,B8TA
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B8P,B8PA
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B8M, B8MA
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Grade
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AISI 4140
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18 Cr- 8 Ni
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18 Cr- 8 Ni
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18 Cr- 8 Ni
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18 Cr- 2 Ni - 2 Mo
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4142, 4145
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AISI TYPE 304
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AISI TYPE 321
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AISI TYPE 305
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AISI TYPE 316
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Range
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Carbon, max
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0.38-0.48
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0.08
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0.08
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0.08
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0.08
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Manganese, max
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0.75-1.00
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2.00
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2.00
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2.00
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2.00
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Phosphorus, max
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0.035
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0.045
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0.045
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0.045
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0.045
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Sulfur, max
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0.040
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0.030
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0.030
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0.03
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0.03
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Silicon, max
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0.15-0.35
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1.00
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1.00
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1.00
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1.00
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Nickel
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8.0-10.5
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9.0-12.0
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10.5-13.0
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10.0-14.0
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Chromium
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0.80-1.10
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18.0-20.0
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17.0-19.0
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17.0-19.0
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16.0-18.0
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Molybdenum
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0.15-0.25
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2.00-3.00
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Columbium
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Titanium
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5XC min.
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| ASTM A 320/A320M TABLE 1 Mechanical Requirements |
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Class and Grade Diameter, in [mm].
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Heat Treatment
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Tensile Strength,min, ksi [MPa]
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Yield Strength, min, 0.2 % offset,ksi [MPa]
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Elongation
in 4D,min, %
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Reduction
of Area,
min, %
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Hardness, max
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Ferritic Steels
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L7 2 1/2 [65] and under
L7M 2 1/2 [65] and under
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quenched and tempered
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125 [860]
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105 [725]
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16
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50
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quenched and tempered at 1150°F (620℃),min.
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100 [690]
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80 [550]
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18
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50
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235 HB or 99 HRB
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Austenitic Steels
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Class 1: B8, B8M, B8P, B8T
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carbide solution treated
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75 [515]
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30 [205]
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35
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50
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223HB or 96HRB
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Class 1A: B8A, B8MA,B8PA, B8TA
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carbide solution treated in the finished condition
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75 [515]
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30 [205]
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35
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50
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192 HB or 90HRB
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Class 2: B8, B8P, B8T,
3/4[20] and under
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carbide solution treated and strain hardened
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125 [860]
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100 [690]
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12
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35
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321HB or 35HRC
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over 3/4 to 1[20 TO 25], incl
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115 [795]
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80 [550]
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15
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30
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321HB or 35HRC
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over 1 to 1 1/4 [25 TO 32] , incl
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105 [725]
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65 [450]
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20
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35
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321HB or 35HRC
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over 1 1/4 to 1 1/2 [32 TO 40] , incl
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100 [690]
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50 [345]
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28
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45
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321HB or 35HRC
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Class 2: B8M
3/4[20] and under
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carbide solution treated and strain hardened
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110 [760]
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95 [655]
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15
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45
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321HB or 35HRC
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over 3/4 to 1[20 TO 25], incl
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100 [690]
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80 [550]
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20
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45
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321HB or 35HRC
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over 1 to 1 1/4 [25 TO 32] , incl
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95 [655]
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65 [450]
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25
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45
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321HB or 35HRC
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over 1 1/4 to 1 1/2 [32 TO 40] , incl
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90 [620]
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50 [345]
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30
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45
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321HB or 35HRC
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1 ksi = 1000 psi
1 ksi = 6.895 N/mm2
1 Mpa = N/mm2
1 Mpa = 0.102 Kg/mm2
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