ASTM A387 Grade 11 (K11789) 1.25Cr-0.5Mo Steel

Alloy Steels

Overview Chemical Composition Mechanical Properties Physical Properties Other Properties

Property Overview

Density7.8g/cm³

Elastic Modulus190GPa

Tensile Strength500 to 600MPa

Yield Strength270 to 350MPa

Brinell Hardness150 to 180HB

Maximum Service Temperature430°C

Weight Calculator

Chemical Composition

0.050 to 0.17%

1.0 to 1.5%

0.45 to 0.65%

0.4 to 0.65%

0.5 to 0.8%

0 to 0.025%

96.2 to 97.6%

Mechanical

Elastic (Young's, Tensile) Modulus

190 GPa

Elongation at Break

25 %

Fatigue Strength

200 to 250 MPa

Poisson's Ratio

0.29

Shear Modulus

73 GPa

Shear Strength

320 to 390 MPa

Tensile Strength: Ultimate (UTS)

500 to 600 MPa

Tensile Strength: Yield (Proof)

270 to 350 MPa

Hardness

Brinell Hardness

150 to 180

Physical

Density

7.8 g/cm 3

Thermal

Latent Heat of Fusion

260 J/g

Maximum Temperature: Mechanical

430 °C

Melting Completion (Liquidus)

1460 °C

Melting Onset (Solidus)

1420 °C

Specific Heat Capacity

470 J/kg-K

Thermal Conductivity

39 W/m-K

Thermal Diffusivity

11 mm 2 /s

Thermal Expansion

13 µm/m-K

Thermal Shock Resistance

15 to 18 points

Electrical

Electrical Conductivity: Equal Volume

7.4 % IACS

Electrical Conductivity: Equal Weight (Specific)

8.5 % IACS

Calculated

PREN (Pitting Resistance)

3.1

Resilience: Ultimate (Unit Rupture Work)

100 to 130 MJ/m 3

Resilience: Unit (Modulus of Resilience)

200 to 320 kJ/m 3

Stiffness to Weight: Axial

13 points

Stiffness to Weight: Bending

24 points

Strength to Weight: Axial

18 to 21 points

Strength to Weight: Bending

18 to 20 points

Environmental

Base Metal Price

2.9 % relative

Embodied Carbon

1.6 kg CO 2 /kg material

Embodied Energy

21 MJ/kg

Embodied Energy

21 MJ/kg 9.1 x 10 3 BTU/lb

Embodied Water

53 L/kg

Embodied Water

53 L/kg 6.3 gal/lb

Registered Designations & Aliases

ASTM A387 Grade 11 (K11789) 1.25Cr-0.5Mo SteelK11789

Standards

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 Pressure Vessels: External Pressure Technology, 2nd ed., Carl T. F. Ross, 2011