ASTM A387 Grade 22 (K21590) 2.25Cr-1Mo Steel

Alloy Steels

Overview Chemical Composition Mechanical Properties Physical Properties Other Properties

Property Overview

Density7.9g/cm³

Elastic Modulus190GPa

Tensile Strength480 to 600MPa

Yield Strength230 to 350MPa

Brinell Hardness150 to 180HB

Maximum Service Temperature460°C

Weight Calculator

Chemical Composition

0.050 to 0.15%

2.0 to 2.5%

0.9 to 1.1%

0.3 to 0.6%

0 to 0.5%

0 to 0.025%

95.1 to 96.8%

Mechanical

Elastic (Young's, Tensile) Modulus

190 GPa

Elongation at Break

21 %

Fatigue Strength

160 to 240 MPa

Poisson's Ratio

0.29

Shear Modulus

74 GPa

Shear Strength

300 to 380 MPa

Tensile Strength: Ultimate (UTS)

480 to 600 MPa

Tensile Strength: Yield (Proof)

230 to 350 MPa

Hardness

Brinell Hardness

150 to 180

Physical

Density

7.9 g/cm 3

Thermal

Latent Heat of Fusion

260 J/g

Maximum Temperature: Mechanical

460 °C

Melting Completion (Liquidus)

1470 °C

Melting Onset (Solidus)

1430 °C

Specific Heat Capacity

470 J/kg-K

Thermal Conductivity

40 W/m-K

Thermal Diffusivity

11 mm 2 /s

Thermal Expansion

13 µm/m-K

Thermal Shock Resistance

14 to 17 points

Electrical

Electrical Conductivity: Equal Volume

7.5 % IACS

Electrical Conductivity: Equal Weight (Specific)

8.6 % IACS

Calculated

PREN (Pitting Resistance)

5.6

Resilience: Ultimate (Unit Rupture Work)

85 to 110 MJ/m 3

Resilience: Unit (Modulus of Resilience)

140 to 320 kJ/m 3

Stiffness to Weight: Axial

13 points

Stiffness to Weight: Bending

24 points

Strength to Weight: Axial

17 to 21 points

Strength to Weight: Bending

17 to 20 points

Environmental

Base Metal Price

3.8 % relative

Embodied Carbon

1.7 kg CO 2 /kg material

Embodied Energy

23 MJ/kg

Embodied Energy

23 MJ/kg 9.8 x 10 3 BTU/lb

Embodied Water

58 L/kg

Embodied Water

58 L/kg 6.9 gal/lb

Registered Designations & Aliases

ASTM A387 Grade 22 (K21590) 2.25Cr-1Mo SteelK21590

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 Properties and Selection: Irons, Steels and High Performance Alloys, ASM Handbook vol. 1, ASM International, 1993 Manufacture and Uses of Alloy Steels, Henry D. Hibbard, 2005 Steels: Processing, Structure, and Performance, 2nd ed., George Krauss, 2015