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You are here: Home- NewsAustenitic stainless steel 304H Heat Resistance and Corrosion Resistance

Austenitic stainless steel 304H Heat Resistance and Corrosion Resistance

Posted:2016/8/20 3:06:10

 

 stainless steel 304H

 

 

 

The austenitic stainless steels are also considered to be the most weldable of the high-alloy steels and can be welded by all fusion and resistance welding processes. Due to its controlled carbon content of 0.04 to 0.10, Alloy 304H provides improved high temperature strength when exposed to temperatures above 800oF.Alloy 304Halso has greater short term and long term creep strength than Alloy 304L at temperatures above 500oC and is more resistant to sensitization than Alloy 304L.

 

 

 

 

304H Chemical Properties


UNS NO

Grade

C

Si

Mn

P

S

Cr

Mo

Ni

N

S30409

304H

0.04/0.10

0.75

2.00

0.045

0.030

18.00/20.00

-

8.00/10.50

0.10

 

304H Physical properties


Denstiy
lbm/in3

Coefficient of
Thermal Expansion (min/in)-°F

Thermal Conductivity BTU/hr-ft-°F

Specific Heat BTU/lbm -°F

Modules of Elasticity (annealed)2-psi

at 68 °F

at 68 – 212°F

at 68 – 1600°F

at 212°F

at 932°F

at 32 – 212°F

in tension (E)

0.285

9.2

11.0

9.4

12.4

0.12

29 x 106

 

304H Application
1-Most commonly used in petroleum refineries
2-Boilers
3-Heat exchangers
4-Condensers
5-Pipelines
6-Cooling towers
7-Steam exhausts
8-Electric generation plants
9-On occasion will be found in fertilizer and chemical plants

 

304H Heat Resistance
Good oxidation resistance in intermittent service to 870O C and in continuous service to 920O C
Continuous use of Alloy 304 in the 425-860°C range is not recommended if subsequent aqueous corrosion resistance is important
Alloy 304H has higher strength at elevated temperatures so is often used for structural and pressure-containing applications at temperatures above about 500°C and up to about 800°C
Alloy 304H will become sensitized in the temperature range of 425-860°C; this is not a problem for high temperature applications, but will result in reduced aqueous corrosion resistance.

 

304H Corrosion Resistance
Resistance to corrosion in oxidizing environments is a result from the 18 to 19% chromium that the 304 alloys contain
Resistance to moderately aggressive organic acids is a result from the 9 to 11% nickel that the 304 alloys contain
At times, Alloy 304L may show a lower corrosion rate than the higher carbon Alloy 304; otherwise, the 304, 304L, and 304H alloys may be considered to perform uniformly in most corrosive environments.

 

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