403 Stainless Steel (UNS S40300)

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1.Topics Covered

Introduction

Chemical Composition

Physical Properties

Mechanical Properties

Thermal Properties

Other Designations

Applications

2.Introduction

Stainless steels are high-alloy steels with good corrosion resistancedue to the presence of large amounts of chromium in these steels. Most of thestainless steels contain about 10% of chromium.

Stainless steels are available in three differentgroups based on their crystalline structure. These groups include martensitic,austenitic and ferritic. The combination of martensitic and ferritic steelsforms a fourth group of stainless steels known as precipitation-hardenedsteels.

The following datasheet provides an overview of grade 403 stainless steel.

3.ChemicalComposition

The chemical composition of grade 403 stainless steels outlined in the following table.

Element	Content (%)
Iron, Fe	86
Chromium, Cr	12.3
Manganese, Mn	1.0
Silicon, Si	0.50
Carbon, C	0.15
Phosphorous, P	0.040
Sulfur, S	0.030
Carbon, C	0.15

4.Physical Properties

The following table shows the physical properties ofgrade 403 stainless steel.

Properties	Metric	Imperial
Density	7.80 g/cm³	0.282 lb/in3

5.Mechanical Properties

The mechanical properties of grade 403 annealedstainless steel are displayed in the following table.

Properties	Metric	Imperial
Tensile strength	485 MPa	70300 psi
Yield strength (@strain 0.200 %)	310 MPa	45000 psi
Fatigue Strength (annealed, @diameter 25mm/0.984 in)	275 MPa	39900 psi
Shear modulus (typical for steel)	76.0 GPa	11000 ksi
Elastic modulus	190-210 GPa	27557-30458 ksi
Poisson's ratio	0.27-0.30	0.27-0.30
Elongation at break (in 50 mm)	25.00%	25.00%
Izod impact (tempered)	102 J	75.2 ft-lb
Hardness, Brinell (converted from Rockwell B hardness)	139	139
Hardness, Knoop (converted from Rockwell B hardness)	155	155
Hardness, Rockwell B	80	80
Hardness, Vickers (converted from Rockwell B hardness)	153	153

6.Thermal Properties

The thermal properties of grade 403 stainless steelare given in the following table.

Properties	Metric	Imperial
Thermal expansion co-efficient (@0-100°C/32-212°F)	9.90 μm/m°C	5.50 μin/in°F
Thermal conductivity (@500°C/932°F)	21.5 W/mK	149 BTU in/hr.ft2.°F

7.Other Designations

Equivalent materials to grade 403 stainless steel aregiven in the table below.

AISI 403	AISI 614	ASTM A176	ASTM A276	ASTM A473
ASTM A314	ASTM A479	ASTM A511	ASTM A580	DIN 1.4000
QQ S763	AMS 5611	AMS 5612	FED QQ-S-763	MIL SPEC MIL-S-862
SAE 51403	SAE J405 (51403)

8.Applications

Grade 403 stainless steel is used in turbine partsand compressor blades.