UNS S17700 (17-7 PH, Alloy 631) Stainless Steel

Precipitation-Hardening Stainless Steels

Material conditionannealed

Overview Chemical Composition Mechanical Properties Physical Properties Other Properties

Property Overview

Density7.7g/cm³

Elastic Modulus200GPa

Tensile Strength1180MPa

Yield Strength430MPa

Brinell Hardness180HB

Maximum Service Temperature890°C

Weight Calculator

Chemical Composition

0 to 0.090%

16 to 18%

6.5 to 7.8%

0 to 1.0%

0 to 0.040%

0 to 0.030%

0.75 to 1.5%

70.5 to 76.8%

Mechanical

Elastic (Young's, Tensile) Modulus

200 GPa

Elongation at Break

23 %

Fatigue Strength

290 MPa

Poisson's Ratio

0.28

Shear Modulus

76 GPa

Shear Strength

750 MPa

Tensile Strength: Ultimate (UTS)

1180 MPa

Tensile Strength: Yield (Proof)

430 MPa

Hardness

Brinell Hardness

180

Rockwell B Hardness

Physical

Density

7.7 g/cm 3

Thermal

Latent Heat of Fusion

290 J/g

Maximum Temperature: Corrosion

410 °C

Maximum Temperature: Mechanical

890 °C

Melting Completion (Liquidus)

1440 °C

Melting Onset (Solidus)

1400 °C

Specific Heat Capacity

480 J/kg-K

Thermal Conductivity

15 W/m-K

Thermal Diffusivity

4.1 mm 2 /s

Thermal Expansion

11 µm/m-K

Thermal Shock Resistance

39 points

Electrical

Electrical Conductivity: Equal Volume

2.3 % IACS

Electrical Conductivity: Equal Weight (Specific)

2.7 % IACS

Calculated

PREN (Pitting Resistance)

Resilience: Ultimate (Unit Rupture Work)

210 MJ/m 3

Resilience: Unit (Modulus of Resilience)

460 kJ/m 3

Stiffness to Weight: Axial

14 points

Stiffness to Weight: Bending

25 points

Strength to Weight: Axial

42 points

Strength to Weight: Bending

32 points

Environmental

Base Metal Price

13 % relative

Embodied Carbon

2.8 kg CO 2 /kg material

Embodied Energy

40 MJ/kg

Embodied Energy

40 MJ/kg 17 x 10 3 BTU/lb

Embodied Water

150 L/kg

Embodied Water

150 L/kg 17 gal/lb

Registered Designations & Aliases

17-7 PHAlloy 631S17700UNS S17700 (17-7 PH, Alloy 631) Stainless Steel

Standards

ASTM A276 ASTM A276: Standard Specification for Stainless Steel Bars and Shapes

ASTM A564 ASTM A564: Standard Specification for Hot-Rolled and Cold-Finished Age-Hardening Stainless Steel Bars and Shapes

ASTM A693 ASTM A693: Standard Specification for Precipitation-Hardening Stainless and Heat-Resisting Steel Plate, Sheet, and Strip

ASTM A693 ASTM A693: Standard Specification for Precipitation-Hardening Stainless and Heat-Resisting Steel Plate, Sheet, and Strip ASTM A564: Standard Specification for Hot-Rolled and Cold-Finished Age-Hardening Stainless Steel Bars and Shapes ASTM A276: Standard Specification for Stainless Steel Bars and Shapes 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 Properties and Selection: Irons, Steels and High Performance Alloys, ASM Handbook vol. 1, ASM International, 1993 Corrosion of Stainless Steels, A. John Sedriks, 1996

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