UNS S21603 (XM-18) Stainless Steel

Austenitic & General Stainless Steels

Overview Chemical Composition Mechanical Properties Physical Properties Other Properties

Property Overview

Density7.7g/cm³

Elastic Modulus200GPa

Tensile Strength690MPa

Yield Strength390MPa

Brinell Hardness200HB

Maximum Service Temperature990°C

Weight Calculator

Chemical Composition

0 to 0.030%

17.5 to 22%

5.0 to 7.0%

2.0 to 3.0%

7.5 to 9.0%

0 to 0.75%

0.25 to 0.5%

0 to 0.045%

0 to 0.030%

57.6 to 67.8%

Mechanical

Elastic (Young's, Tensile) Modulus

200 GPa

Elongation at Break

45 %

Fatigue Strength

360 MPa

Poisson's Ratio

0.28

Reduction in Area

57 %

Shear Modulus

79 GPa

Shear Strength

490 MPa

Tensile Strength: Ultimate (UTS)

690 MPa

Tensile Strength: Yield (Proof)

390 MPa

Hardness

Brinell Hardness

200

Rockwell B Hardness

Physical

Density

7.7 g/cm 3

Thermal

Latent Heat of Fusion

290 J/g

Maximum Temperature: Corrosion

420 °C

Maximum Temperature: Mechanical

990 °C

Melting Completion (Liquidus)

1420 °C

Melting Onset (Solidus)

1380 °C

Specific Heat Capacity

480 J/kg-K

Thermal Expansion

17 µm/m-K

Thermal Shock Resistance

15 points

Calculated

PREN (Pitting Resistance)

Resilience: Ultimate (Unit Rupture Work)

270 MJ/m 3

Resilience: Unit (Modulus of Resilience)

380 kJ/m 3

Stiffness to Weight: Axial

14 points

Stiffness to Weight: Bending

25 points

Strength to Weight: Axial

25 points

Strength to Weight: Bending

22 points

Environmental

Base Metal Price

17 % relative

Embodied Carbon

3.6 kg CO 2 /kg material

Embodied Energy

50 MJ/kg

Embodied Energy

50 MJ/kg 21 x 10 3 BTU/lb

Embodied Water

160 L/kg

Embodied Water

160 L/kg 20 gal/lb

Registered Designations & Aliases

S21603UNS S21603 (XM-18) Stainless SteelXM-18

Standards

ASTM A240 ASTM A240: Standard Specification for Chromium and Chromium-Nickel Stainless Steel Plate, Sheet, and Strip for Pressure Vessels and for General Applications

ASTM A479 ASTM A479: Standard Specification for Stainless Steel Bars and Shapes for Use in Boilers and Other Pressure Vessels

ASTM A479 ASTM A479: Standard Specification for Stainless Steel Bars and Shapes for Use in Boilers and Other Pressure Vessels ASTM A240: Standard Specification for Chromium and Chromium-Nickel Stainless Steel Plate, Sheet, and Strip for Pressure Vessels and for General Applications Welding Metallurgy and Weldability of Stainless Steels, John C. Lippold and Damian J. Kotecki, 2005 ASTM A959: Standard Guide for Specifying Harmonized Standard Grade Compositions for Wrought Stainless Steels

ASTM A959 ASTM A959: Standard Guide for Specifying Harmonized Standard Grade Compositions for Wrought Stainless Steels