ASTM

MATERIALS-STUDBOLTS
High temperature serviceASTM A193ASTM A193 / A193M Standard
Specification for Alloy-Steel and Stainless Steel Bolting Materials for High Temperature or High Pressure Service and Other Special Purpose Applications
Low temperature serviceASTM A320ASTM A320 / A320M Standard
Specification for Alloy-Steel and Stainless Steel Bolting Material for Low-Temperature Service or Both

MATERIALS-HEX NUTS
High / Low temperature serviceASTM A194ASTM A194 / A194M - 09 Standard
Specification for Carbon and Alloy-Steel Nuts for Bolts for High-Pressure or High-Temperature Service or Both.

MATERIALS

Bolt A193Bolt A320Nut A194
High TemperatureLow TemperatureHigh Pressure and High Temperature
Alloy Steel : B7, B7M, B16Alloy Steel : L7, L7MAlloy Steel : 2H, 2HM, GR.4, GR.7, GR.7M
Stainless Steel : B8, B8MStainless Steel : GR.8, GR.8M

Coating

Mechanical Properties

ASTM A193(Bolts)

GradeSizeTensile (Min) MpaTensile (Min) ksiYield (Max) MpaYield (Max) ksiElongation (Min) %Hardness Brinell HBHardness Rockwell HR
B5All Size6901005508016--
B6All Size7601105858515--
B7<=2 1/2″86012572510516321 max35 C max
2 3/4″ to 4″ 7901156559516302 max33 C max
>4″6901005157518277 max29 C max
B8 Cl.1All Size515752053030223 max96 C max
B16<=2 1/2″86012572510518321 max35 C max
2 3/4″ to 4″ 7601106559517302 max33 C max
>4″ 6901005858516277 max29 C max

ASTM A194(Nuts)

GradeSizeHardness Brinell HBHardness Rockwell HR
2H<= 1 1/2"248-35224-38 C
>= 1 1/2"212-35238 C max
3All Size248-35224-38 C
4All Size248-35224-38 C
6All Size228-27120-28 C
7All Size248-35224-38 C
8All Size126-30060-105 B

ASTM A320(Bolts&Nuts)

GradeSizeTensile (Min) MpaTensile (Min) ksiYield (Max) MpaYield (Max) ksiElongation (Min) %Hardness Brinell HBHardness Rockwell HR
L7All Size86012572510516--
B8 Cl.1All Size515752053030223 max96 B max

Chemical Properties

ASTM A193(Bolts)

Chemical Composition, %
GradeCMnP max.S max.SiCrMoOther
B50.10 min1.0 max0.040.031.0 max4.0-6.00.40-0.65-
B60.15 max1.0 max0.040.031.0 max11.5-11.3--
B70.37-0.490.65-1.100.0350.040.15-0.350.75-1.200.15-0.25-
B8 Cl.10.08 max2.0 max0.0450.031.0 max18.0-20.0-Ni : 8-10.5
B160.36-0.470.45-0.700.0350.040.15-0.350.80-1.150.50-0.65V & Al*

  • A193 Grade B16 have Vanadiam = 0.25-0.35 and Aluminuim = 0.015 max

ASTM A194(Nuts)

Chemical Composition, %
GradeCMnP max.S max.SiCrMoOther
2H0.04 min1.0 max0.040.050.04 max---
30.10 min1.0 max0.040.031.0 max4.0-6.00.40-0.65-
40.4-0.50.7-0.90.0350.040.15-0.35-0.20-0.30-
60.15 max1.0 max0.040.031.0 max11.5-13.5-
70.37-0.490.65-1.100.040.040.15-0.350.75-1.200.15-0.25
80.08 max2.0 max0.0450.031.0 max18.0-20.0-Ni : 8-10.5

ASTM A320(Bolts&Nuts)

Chemical Composition, %
GradeCMnP max.S max.SiCrMoOther
L70.38-0.480.75-1.00.0350.040.15-0.350.15-0.25--
B8 Cl.10.08 max2.0 max0.0450.031.0 max18.0-20.0-Ni : 8-10.5