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Materials of Construction - Metals - 304/304H SS
December 12, 2001

Introduction
Chemical Composition
Corrosion Resistance
Designations
Specifications
Physical Properties
Mechanical Properties

Fabrication
Associated Links

Introduction

Type 304 stainless steel is the most versatile and one of the most widely applied of the 300 series stainless steels.  It has excellent forming and welding characteristics.  The carefully controlled analysis of Type 304 enables it to be deep drawn more severely than Types 301 and 302 without intermediate softening.  This property has made this grade dominant in the manufacture of drawn stainless steel parts.  It is readily brake brake or roll formed into a variety of other parts for application in the industrial, architectural and transportation fields.

 

Type 304 also has outstanding welding characterisitics.  Post-weld annealing is not required to restore the excellent performance of this grade in a wide range of midly corrosive conditions.

 

Chemical Composition (wt% typical)

  304 304H
Nickel Ni 8.0 - 10.5 8.0 - 10.5
Chromium Cr 18.0 - 20.0 18.0 - 20.0
Manganese Mn 2.0 max 2.0 max
Iron Fe Balance Balance
Carbon C 0.08 max 0.04-0.10
Phosphorus P 0.045 max 0.045 max
Sulphur S 0.030 max 0.030 max
Silicon Si 0.75 max 0.75 max
Nitrogen N 0.10 max -

Corrosion Resistance

Chart15.BMP (249118 bytes)

Designations

UNS S30400

Alternate Names: 18-8 Stainless Steel

Specifications

ASTM Tube and Pipe A430
Pipe - Welded A312, A409, A813, A814
Pipe - Seamless A312, A376
Tube - Welded A269, A688
Tube - Seamless A269, A271
Bars and Shapes A276, A479
Forgings A336, A473
Forged Flanges and Fittings A403
Plate and Sheet A240, A666
Strip A240, A666
Rod and Shapes A276, A479

Physical Properties

Electrical Resistivity 68°F 72 microhm-cm
Coefficient of Thermal Expansion 0-100°C (32-212°F) 9.6 E-6 in/in °F
Magnetic Permeability 1.02
Themal Conductivity 100°C (212°F)
500°C (932°F)
9.4 BTU/ft h °F
12.4 BTU/ft h °F

Mechanical Properties

Ultimate Tensile Strength 579 MPa (84,000 psi)
Elongation in 50.8 mm (2 in.) 55%
Yield Strength (0.2% offset)  241 MPa (35,000 psi)
Hardness  80 Rb
149 BHN
Impact Charpy 135 ft lbs
Modulus of Elasticity (Tension) 193,052 MPa (28,000,000 psi)

Fabrication

To follow