Stainless Steel – Grade 430F (UNS S43020)

Topics Covered

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

Introduction

Stainless steels are called as high-alloy steels. Due to the presence of large amounts of chromium in the range of 4 to 30%, they have high corrosion resistance than other steels. Stainless steels are classified into martensitic, ferritic and austenitic based on their crystalline structure. However, stainless steels present in the form of a combination of martensitic and austenitic steels are known as precipitation-hardened steels.

The following datasheet will provide more details about grade 430F stainless steel, which has moderate strength and corrosion resistance.

Chemical Composition

The following table shows the chemical composition of grade 430F stainless steel.

Element Content (%)
Iron, Fe 81
Chromium, Cr 16
Manganese, Mn ≤ 1.25
Silicon, Si ≤ 1
Molybdenum, Mo ≤ 0.60
Sulfur, S ≥ 0.15
Carbon, C ≤ 0.12
Potassium, K ≤ 0.060

Physical Properties

The physical properties of grade 430F stainless steel are given in the following table.

Properties Metric Imperial
Density 7.80 g/Cm³ 0.282 lb/in³
Melting point 1482°C 2700°F

Mechanical Properties

The mechanical properties of annealed grade 430F stainless steel are displayed in the following table.

Properties Metric Imperial
Tensile strength, ultimate 550 MPa 79800 psi
Modulus of elasticity 200 GPa 29000 ksi
Poisson’s ratio 0.27 – 0.30 0.27 – 0.30
Elongation at break (in 50 mm) 25% 25%
Hardness, Brinell 170 170
Hardness, Knoop (converted from Brinell Hardness) 189 189
Hardness, Rockwell B (converted from Brinell Hardness) 86 86
Hardness, Vickers (converted from Brinell Hardness) 178 178

Other Designations

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Other designations that are equivalent to grade 430F stainless steel include the following:

  • ASTM A314
  • ASTM A473
  • ASTM A581
  • ASTM A582
  • ASTM A895
  • DIN 1.4104
  • AFNOR Z 10 CF 17
  • UNI x 10 CrS 17
  • JIS SUS 430
  • SS 2383
  • MIL SPEC MIL-S-862
  • SAE 51430F
  • SAE J405 (51430F)

Fabrication and Heat Treatment

Machinability

Machining of grade 430F stainless steel can be done with good feeds and speeds.

Welding

Grade 430F stainless steel cannot be welded due to its high sulfur content. If necessary, welding can be performed using low heat settings and AWS E/ER430 filler metal.

Hot Working

Grade 430F stainless steel can be hot worked by initially bringing the material to 816°C (1500°F) and then slowly to 1066 to 1149°C (1950 to 2100°F).

Cold Working

Grade 430F stainless steel can withstand only moderate cold forming.

Annealing

Grade 430F stainless steel can be annealed at temperature ranging from 677 to 760°C (1250 to 1400°F) and then air cooled.

Hardening

Grade 430F stainless steel is unresponsive to heat treatment.

Applications

The following are the major applications of grade 430F stainless steel.

  • Fasteners
  • Gears
  • Shafts
  • Pinions

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