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PRODUCT MATERIAL

STAINLESS STEEL 304-304HDownload

Dual certified 304/304H is used as a material of construction up to 1500°F. Slight scaling begins at about 1200°F. This is the 0.04% minimum carbon version of type 304 stainless. It has general corrosion resistance similar to the low carbon 304/304L. However, it is subject to carbide precipitation in the heat affected zone (HAZ) of welds. Weldments may be sensitive to HAZ intergranular corrosion in oxidizing acid environments, and to polythionic acid stress corrosion cracking. The carbide precipitation is not harmful to high temperature mechanical properties. 
304/304H is welded using the 22Cr 11Ni filler wire (ER308), or covered electrodes (E308). Post-weld heat treatment is not necessary for most high temperature service.

Chemistry

 

Cr

Ni

C

Mn

Si

P

S

Fe

MIN

18.0

8.0

0.04

-

-

-

-

-

MAX

20.0

10.5

0.08

2.0

0.75

0.04

0.03

Balance

Specifications

AMS 5513
ASME SA 240
ASTM A 240ASTM A 959
W. Nr./EN 1.4948

Inventory

304 / 304H Plate, 304 / 304H Weld Wire

Common Trade Names

304H Stainless

Features

· Elevated temperature service to 1500°F

· Corrosion resistance similar to 304/304L

Applications

· Pressure Vessels

· Petrochemical Equipment

Physical Properties

Density: 0.285 lb/inch3

Temperature, °F

212

1600

Coefficient* of Thermal Expansion, in/in°F x 10-6

9.4

-

Thermal Conductivity
Btu • ft/ft2 • hr • °F

9.4

10.9

* 70°F to indicated temperature.

Mechanical Properties

Representative Tensile Properties
Maximum Allowable Stresses, ASME Section VIII, Div 1 Temperature, °

Temperature, °F

200

400

600

800

1000

1200

1400

1500

stress, ksi

20.0

18.3

16.6

15.2

14.0

6.1

2.3

1.4