ENQUIRY

aSTM A 194

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
Grade 2H
A 194
Grade 2HM
A 194
Grade 4
A 194
Grade 8
A 194
Grade 8M
A 194
Grade 8T
A 194
Grade 4
A 320
Grade 7.
5 Chemical composition % % % % % % % %
6 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 ---      --- ---      ---
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