Stainless Steel 350 Alloy (UNS S35000)

Topics Covered

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

Introduction

Stainless steels are high-alloy steels. They contain about 4-30% of chromium. They are further classified into three types such as martensitic, austenitic, and ferritic steels. Another group of stainless steels are precipitation-hardened steels. They are a combination of austenitic and martensitic steels.

Grade 350 stainless steel alloy is a heat treatable austenitic/martensitic alloy. The following datasheet gives an overview of grade 350 stainless steel alloy.

Chemical Composition

The following table shows the chemical composition of grade 350 stainless steel alloy.

Element Content (%)
Iron, Fe
72.69 - 76.29
Chromium, Cr 16-17
Nickel, Ni 4 - 5
Molybdenum, Mo 2.5-3.25
Manganese, Mn 0.5-1.25
Silicon, Si 0.5
Nitrogen, N 0.07-0.13
Carbon, C 0.07-0.11
Phosphorus, P 0.04
Sulfur, S 0.03

Physical Properties

The physical properties of grade 350 stainless steel alloy are highlighted in the following table.

Properties Metric Imperial
Density 7.7-8.03 cm3 0.278-0.290 lb/in3

Mechanical Properties

The following table outlines the mechanical properties of grade 350 stainless steel alloy.

Properties Metric Imperial
Tensile strength 1105 MPa 160266 psi
Yield strength 415 MPa 60190 psi
Elastic modulus 190-210 GPa 27557-30458 ksi
Poisson's ratio 0.27-0.30 0.27-0.30
Elongation 30% 30%
Hardness 95 95

Thermal Properties

The thermal properties of grade 350 stainless steel alloy are displayed in the following table.

Properties Metric Imperial
Thermal expansion co-efficient (@ 20-100°C/70-212°F)
11.3 µm/m°C 6.55 µin/in°F
Thermal conductivity (@ 38°C/100°F)
14.5 W/mK 100.7 BTU in/hr.ft².°F

Other Designations

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Other designations that are equivalent to grade 350 stainless steel alloy include:

  • AMS 5546
  • AMS 5548
  • AMS 5554
  • ASTM A579
  • ASTM A693
  • MIL S-8840
  • AMS 5745
  • AMS 5774
  • AMS 5775
  • SAE J467 (AM-350)

Fabrication and Heat Treatment

Machinability

Grade 350 stainless steel alloy can be machined using practices applied on high strength stainless steels. It is recommended to use sharp tooling, positive feeds, slow speeds, and adequate lubricant.

Welding

Grade 350 stainless steel alloy can be welded using all common techniques except oxyacetylene welding method. After welding, this alloy is annealed to restore maximum properties.

Hot Working

Hot working of grade 350 stainless steel alloy is performed after heating at 1177°C (2150°F). This process is finished at 982°C (1800°F)

Cold Working

Grade 350 stainless steel alloy can be cold worked in the annealed condition. Radical deformation of this alloy is limited due to its high work hardening rate and the formation of martensite.

Annealing

Grade 350 stainless steel is annealed by soaking at 1010 to 1066°C (1850 to 1950°F) followed by quenching.

Tempering

Grade 350 stainless steel is soaked at -73°C (-100°F). It is then tempered at 454°C (850°F) to attain maximum strength or at 538°C (1000°F) to attain maximum toughness and corrosion resistance for 3 to 4 h.

Hardening

Grade 350 stainless steel can be hardened by sub zero or double aging. Before performing this process, this alloy is prepared by rapidly cooling at 932°C (1710°F).

Applications

Grade 350 stainless steel is used in valve and gas turbine components, and industrial cutters which require good strength and corrosion resistance.

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