ASTM A387 Grade 9 (K90941) 9Cr-1Mo Steel

Alloy Steels

Overview Chemical Composition Mechanical Properties Physical Properties Other Properties

Property Overview

Density7.8g/cm³

Elastic Modulus190GPa

Tensile Strength500 to 600MPa

Yield Strength230 to 350MPa

Brinell Hardness150 to 180HB

Maximum Service Temperature600°C

Weight Calculator

Chemical Composition

0 to 0.15%

8.0 to 10%

0.9 to 1.1%

0.3 to 0.6%

0 to 1.0%

0 to 0.025%

0 to 0.040%

87.1 to 90.8%

Mechanical

Elastic (Young's, Tensile) Modulus

190 GPa

Elongation at Break

20 to 21 %

Fatigue Strength

160 to 240 MPa

Poisson's Ratio

0.28

Shear Modulus

75 GPa

Shear Strength

310 to 380 MPa

Tensile Strength: Ultimate (UTS)

500 to 600 MPa

Tensile Strength: Yield (Proof)

230 to 350 MPa

Hardness

Brinell Hardness

150 to 180

Physical

Density

7.8 g/cm 3

Thermal

Latent Heat of Fusion

270 J/g

Maximum Temperature: Mechanical

600 °C

Melting Completion (Liquidus)

1460 °C

Melting Onset (Solidus)

1410 °C

Specific Heat Capacity

470 J/kg-K

Thermal Conductivity

26 W/m-K

Thermal Diffusivity

6.9 mm 2 /s

Thermal Expansion

13 µm/m-K

Thermal Shock Resistance

14 to 17 points

Electrical

Electrical Conductivity: Equal Volume

9.0 % IACS

Electrical Conductivity: Equal Weight (Specific)

10 % IACS

Calculated

PREN (Pitting Resistance)

Resilience: Ultimate (Unit Rupture Work)

83 to 110 MJ/m 3

Resilience: Unit (Modulus of Resilience)

140 to 310 kJ/m 3

Stiffness to Weight: Axial

14 points

Stiffness to Weight: Bending

25 points

Strength to Weight: Axial

18 to 21 points

Strength to Weight: Bending

18 to 20 points

Environmental

Base Metal Price

6.5 % relative

Embodied Carbon

2.1 kg CO 2 /kg material

Embodied Energy

28 MJ/kg

Embodied Energy

28 MJ/kg 12 x 10 3 BTU/lb

Embodied Water

87 L/kg

Embodied Water

87 L/kg 10 gal/lb

Registered Designations & Aliases

ASTM A387 Grade 9 (K90941) 9Cr-1Mo SteelK90941

Standards

ASTM A182 ASTM A182: Standard Specification for Forged or Rolled Alloy and Stainless Steel Pipe Flanges, Forged Fittings, and Valves and Parts for High-Temperature Service

ASTM A387 ASTM A387: Standard Specification for Pressure Vessel Plates, Alloy Steel, Chromium-Molybdenum

ASTM A387 ASTM A387: Standard Specification for Pressure Vessel Plates, Alloy Steel, Chromium-Molybdenum ASTM A182: Standard Specification for Forged or Rolled Alloy and Stainless Steel Pipe Flanges, Forged Fittings, and Valves and Parts for High-Temperature Service Pressure Vessels: External Pressure Technology, 2nd ed., Carl T. F. Ross, 2011 Manufacture and Uses of Alloy Steels, Henry D. Hibbard, 2005 Steels: Processing, Structure, and Performance, 2nd ed., George Krauss, 2015