Stainless Steel - Grade 317 (UNS S31700)

Topics Covered

Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Other Designations
Fabrication and Heat Treatment
Machinability
Welding
Hot Working
Cold Working
Annealing
Hardening
Applications

Introduction

Stainless steels are known as high-alloy steels. They consist about 4-30% of chromium. They are classified into martensitic, austenitic, and ferritic steels based on their crystalline structure.

Grade 317 stainless steel is a modified version of 316 stainless steel. It has high strength and corrosion resistance. The following datasheet gives more details about grade 317 stainless steel.

Chemical Composition

The chemical composition of grade 317 stainless steel is outlined in the following table.

Element Content (%)
Iron, Fe 61
Chromium, Cr 19
Nickel, Ni 13
Molybdenum, Mo 3.50
Manganese, Mn 2
Silicon, Si 1
Carbon, C 0.080
Phosphorous, P 0.045
Sulfur, S 0.030

Physical Properties

The following table shows the physical properties of grade 317 stainless steel.

Properties Metric Imperial
Density 8 g/cm3 0.289 lb/in³
Melting point 1370°C 2550°F

Mechanical Properties

The mechanical properties of annealed grade 317 stainless steel are displayed in the following table.

Properties Metric Imperial
Tensile strength 620 MPa 89900 psi
Yield strength 275 MPa 39900 psi
Elastic modulus 193 GPa 27993 ksi
Poisson's ratio 0.27-0.30 0.27-0.30
Elongation at break (in 50 mm) 45% 45%
Hardness, Rockwell B 85 85

Thermal Properties

The thermal properties of grade 317 stainless steel are given in the following table.

Properties Metric Imperial
Thermal expansion co-efficient (@ 0-100°C/32-212°F) 16 µm/m°C 8.89 µin/in°F
Thermal conductivity (@ 100°C/212°F) 16.3 W/mK 113 BTU in/hr.ft².°F

Other Designations

Other designations equivalent to grade 317 stainless steel are included in the following table.

ASTM A167 ASTM A276 ASTM A478 ASTM A814 ASME SA403
ASTM A182 ASTM A312 ASTM A511 QQ S763 ASME SA409
ASTM A213 ASTM A314 ASTM A554 DIN 1.4449 MIL-S-862
ASTM A240 ASTM A403 ASTM A580 ASME SA240 SAE 30317
ASTM A249 ASTM A409 ASTM A632 ASME SA249 SAE J405 (30317)
ASTM A269 ASTM A473 ASTM A813 ASME SA312

Fabrication and Heat Treatment

Machinability

Grade 317 stainless steel is tougher than 304 stainless steel. It is recommended to use chip breakers. Hardenability of this alloy will be reduced if constant feeds and low speeds are used.

Welding

Grade 317 stainless steel can be welded using fusion and resistance methods. Oxyacetylene welding method is not preferred for this alloy. AWS E/ER317 or 317L filler metal can be used to obtain good result.

Hot Working

Grade 317 stainless steel can be hot worked using all common hot working procedures. It is heated at 1149-1260°C (2100-2300°F). It should not be heated below 927°C (1700°F). Post-work annealing can be done to retain the corrosion resistance property.

Cold Working

Stamping, shearing, drawing, and heading can be done successfully. Post-work annealing is performed in order to reduce internal stress.

Annealing

Grade 317 stainless steel is annealed at 1010-1121°C (1850-2050°F) followed by cooling.

Hardening

Grade 317 stainless steel does not react to heat treatment. It can be hardened by cold working.

Applications

Grade 317 stainless steel is used in the following applications:

  • Pulping paper
  • Textile
  • Chemical equipment


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