A193

Alloy steel and stainless steel bolting materials for high temperature or high pressure service.

A193

 

A193 Grades
B7 Alloy steel, AISI 4140/4142 quenched and tempered
B8 Class 1 Stainless steel, AISI 304, carbide solution treated.
B8M Class 1 Stainless steel, AISI 316, carbide solution treated.
B8 Class 2 Stainless steel, AISI 304, carbide solution treated, strain hardened
B8M Class 2 Stainless steel, AISI 316, carbide solution treated, strain hardened

 

A193 Mechanical Properties

 

Grade Size in Inch Min Tempering, Temperature ̊F Tensile ksi, min Yield, ksi, min Elong, %, min RA % min HBW HRC HRB

B7 : Chromium-Molybdenum

Up to 2-1/2 1100 125 105 16 50

321 max

35 max

 
2-5/8 - 4 1100 115 95 16 50
4-1/8 - 7 1100 100 75 18 50

B7M : Chromium-Molybdenum

Up to 4 1150 100 80 18 50 235 max   99 max
4-1/8 - 7 1150 100 75 18 50      

B16 : Chromium-Molybdenum-Vanadium

Up to 2-1/2 1200 125 105 18 50

321 max

35 max

 
2-5/8 - 4 1200 110 95 17 45  
4-1/8 - 7 1200 100 85 16 45  
Class 1 and 1D : B8, B8M, B8P, B8LN, B8MLN, B8CLN, All   75 30 30 50 223 max 35 max 96 max
Class 1: B8C,B8T All   75 30 30 50 223 max 35 max 96 max

Class 2 : B8, B8C, B8P, B8T, B8Nᴰ

Up to 3/4   125 100 12 35

321 max

35 max

 
7/8 - 1   115 80 15 35
1-1/8 - 1-1/4   105 65 20 35
1-3/8 - 1-1/2   100 50 28 45

Class 2 : B8M, B8MN, B8MLCuNAᴰ

Up to 3/4   110 95 15 45

321 max

35 max

 
7/8 - 1   100 80 20 45
1-1/8 - 1-1/4   95 65 25 45
1-3/8 - 1-1/2   90 50 30 45

Class 2B: B8, B8M2ᴰ

Up to 2   95 75 25 40

321 max

35 max

 
2-1/8 - 2-1/2   90 65 30 40
2-5/8 - 3   80 55 30 40

Class 2C: B8M3ᴰ

Up to 2   85 65 30 60

321 max

35 max

 
Over 2   85 60 30 60

 

A193 Chemical Properties

 

Element B7, B7M B16
S41000 (410)
B8, B8A
S30400 (304)
B8M, B8MA,B8M2,B8M3
S31600 (316)
B8C,B8T
S32100 (321)
Carbon 0.37-0.49 0.36-0.47 0.08 0.080 0.08
Manganese 0.65-1.10 0.45-0.70 2.00 2.000 2.00
Phosporous, Max 0.035 0.035 0.05 0.045 0.045
Sulfur, Max 0.040 0.04 0.03 0.030 0.03
Silicon 0.15-0.35 0.15-0.35 1.00 1.000 1.00
Chromium 0.75-1.20 0.80-1.15 18.0-20.0 16.0-18.0 17.0-19.0
Molybdenum 0.15-0.25 0.50-0.65 .... 2.00-3.00 ....
Nickel     8.0-11.0 10.0-14.0 9.0-12.0
Vanadium .... 0.25-0.35 .... .... ....
Aluminium, max %ᴱ .... 0.015 .... .... ....
Titanium         5x(C+N)min, 0.70 max
Nitrogen         0.10 max

 

A194 Recommended Hardware

 

Bolt Grade Nuts Washers
B7 A194 Grade 2H F436
B8 Class 1 A194 Grade 8 SS304
B8M Class 1 A194 Grade 8M SS316
B8 Class 2 A194 Grade 8 SS304
B8M Class 2 A194 Grade 8M SS316