304 Mechanical Properties

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Room Temperature Mechanical Properties

Minimum mechanical properties for annealed Alloys 304 and 304L austenitic stainless steel tube as required by ASTM specifications A213 and ASME specification SA-213 are shown below.

Property Minimum Mechanical Properties
Required by ASTM A213 & ASME SA-213
304 304L 304H
0.2% Offset
Yield
Strength,
    psi
    MPa


30,000
205


25,000
170


30,000
205
Ultimate
Tensile
Strength,
   psi
   MPa



75,000
515



70,000
485



75,000
515
Percent
Elongation in
2 in. or 51 mm

40.0

40.0

40.0
Hardness,
Max.,
   Brinell
   RB


201
92


201
92


201
92

Low and Elevated Temperature Properties
Typical short time tensile property data for low and elevated temperatures are shown below. At temperatures of 1000°F (538°C) or higher, creep and stress rupture become considerations. Typical creep and stress rupture data are also shown below.

Test
Temperature

0.2% Yield
Strength

Tensile
Strength
Elongation
°F °C psi (MPa) psi (MPa) Percent in
2″ or
51mm
-423 -253 100,000 690 250,000 1725 25
-320 -196 70,000 485 230,000 1585 35
-100 -79 50,000 354 150,000 1035 50
70 21 35,000 240 90,000 620 60
400 205 23,000 160 70,000 485 50
800 427 19,000 130 66,000 455 43
1200 650 15,500 105 48,000 330 34
1500 815 13,000 90 23,000 160 46

Impact Resistance
The annealed austenitic stainless steel tube maintain high impact resistance even at cryogenic temperatures, a property which, in combination with their low temperature strength and fabricability, has led to their use in handling liquified natural gas and other cryogenic environments. Typical Charpy V-notch impact data are shown below.

Temperature Charpy V-Notch Energy Absorbed
°F °C Foot – pounds Joules
75 23 150 200
-320 -196 85 115
-425 -254 85 115

Fatigue Strength
The fatigue strength or endurance limit is the maximum stress below which material is unlikely to fail in 10 million cycles in air environment. The fatigue strength for austenitic stainless steel, as a group, is typically about 35 percent of the tensile strength. Substantial variability in service results is experienced since additional variables influence fatigue strength. As examples – increased smoothness of surface improves strength, increased corrosivity of service environment decreases strength.
General Properties
Chemical Composition
Resistance to Corrosion
Physical Properties
Mechanical Properties
Welding
Heat Treatment
Cleaning
304/304L/304LN/304H Tubing and Pipe
S32304S31803S32205S32750Mechanical Properties
Brinell and Rockwell Hardness Conversion Chart
Hardness Testing General
Brinell Hardness Testing
Rockwell Hardness Testing
Vickers Hardness Testing
Carbon Low Alloy Steel and Cast Steel Hardness Conversion Table
Rockwell Rockwell Superficial Brinell Vickers Shore Hardness Conversion Table

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