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Chemical Composition For Alloy Steel Nuts

 
 
Grade of carbon and alloy steel for nuts to BS 1750 and ASTM A 194
1
SYMBOL
2H
2HM
4
8
8M
8T
L4
7 / 7M
2
Type Ferritic Ferritic Ferritic Austenitic
Unstabilized
Austenitic Austenitic
Stabilized
Ferritic Ferritic
3
Service conditions High Temp. High Temp. High Temp. High Low.
Temp.
High Low.
Temp.
High Low. Temp. Low Temp. Low Temp.
4
Material specication
ASTM
A 194 A 194 A 194 A 194 A 194 A 194 A 194 A 320
Grade 2H Grade 2HM Grade 4 Grade 8 Grade 8M Grade 8T Grade 4 Grade 7.
5
Chemical composition % % % % % % % %
C. 0.40 min. 0.40 min. 0.40 --- 0.50 0.08 max. 0.08 max. 0.08 max. 0.40---0.50 0.37---0.49
Mn. 1.00 max. 1.00 max. 0.70---0.90 2.00 max. 2.00 max. 0.70---0.90 0.70---0.90 0.65---1.10
Si. 0.40 max. 0.040 max. 0.15---0.35 1.00 max. 1.00 max. 0.20---0.35 0.15---0.35 0.15---0.35
P. 0.040 max. 0.040 max. 0.035 max. 0.045 max. 0.045 max. 0.045 max. 0.035 max. 0.040 max.
S. 0.050 max. 0.050 max. 0.040 max. 0.030 max. 0.030 max. 0.030 max. 0.040 max. 0.040 max.
Cr. --- --- --- --- --- --- 18.00---20.00 16.00---18.00 17.00---19.00 --- --- 0.75---1.20
Ni. --- --- --- --- --- --- 8.00---10.50 10.00---14.00 9.00---12.00 --- --- --- ---
Mo. --- --- --- --- 0.20---0.30 --- --- 2.00---3.00 --- --- 0.20---0.30 0.15---0.25
V. --- --- --- --- --- --- --- --- --- --- --- --- --- --- --- ---
Ti. --- --- --- --- --- --- --- --- --- --- 5xCMIN --- --- --- ---
6
Heat Treatment Oil quenched & tempered at 8500F 4550C min Oil quenched & tempered at 11500F 6200C min Oil quenched & tempered at 11000F or 5950C min Carbide solution Carbide solution Carbide solution Oil quenched & tempered at 11000F or 5950C min Oil quenched & tempered at 11000F or 5950C min
7
Brinell Hardness 248/352 22 RC max. 248/352 126/300 126/300 126/300 248/352 248/352
8
Impact value --- --- --- --- --- --- --- --- --- --- --- --- 20 ft. lbf. at 1500F 20 ft. lbf. at 1500F
 
 
   
   
 
 
 
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