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What is the difference between stainless steel 304L and stainless steel 304H?

What is the difference between stainless steel 304L and stainless steel 304H?

304H stainless steel has a higher carbon content than 304L stainless steel, which makes it perfect for applications requiring great mechanical properties at raised temperatures. It is as often as possible utilized as a development material up to around 1500 degrees Fahrenheit, yet gives improved high temperature quality when presented to temperatures exceeding 800 degrees Fahrenheit. 304L and 304H stainless steels are highly useful in a variety of applications,  and are among the most adaptable and generally utilized of all the stainless steel grades.

The presence of these stainless steel variations can cause some disarray, particularly when the names and definitions of two stainless steel alloys are nearly equivalent. This is the situation with grade 304H and 304L  stainless steel. Type 304H is the most broadly utilized austenitic treated steel. It is otherwise called 18/8 stainless steel because of its composition, which incorporates 18% chromium and 8% nickel. It has great framing and welding properties just as solid corrosion resistance and quality. Type 304L stainless steel having extra-low carbon version than 304H type. The lower carbon content in 304L limits deleterious or harmful carbide precipitation due to welding. 304L can, in this manner, be utilized as welded in extreme erosion conditions, and it disposes of the requirement for tempering. 

304H and 304L can be press-heated or fold framed into various shapes for different applications across mechanical, design and transportation parts. In order to solve the ultra-low carbon austenitic stainless steel  created by the precipitation of Cr23C6 which makes the stainless steel to have serious intergranular erosion under certain conditions, the sharpened state has preferred protection from intergranular consumption over 304H stainless steel. In addition to the lower strength, different properties are equivalent to 321 stainless steel, predominantly utilized for corrosion-resistant equipment and components that need to be solution treated after welding, and can be utilized to produce different kinds of instrument bodies. 304H stainless steel has a carbon mass fraction of 0.04%~0.10%, and the high temperature performance  is superior to 304L stainless steel.

Applications 304L & 304H Stainless Steel 

  • Back Splashes
  • Plumbing Materials
  • Architectural Moldings & Trim
  • Kitchen Equipment (sinks, saucepans)
  • Textile, Paper, Pharmaceutical & Chemical Industry Processing Equipment

Grade 304H has higher quality at raised temperatures so is regularly utilized for structural and weight containing applications at temperatures above about 500°C and up to about 800°C. 304H will get sharpened in the temperature scope of 425-860°C; this isn't an issue for high temperature applications, but will result in reduced aqueous corrosion resistance. It is normal for 304H and 304L to be loaded in dual certified structure, especially in plate, pipe and round bar. These things have chemical and mechanical properties complying with both 304H and 304L specifications. Such double confirmed item might be unsuitable for high temperature applications. 

Chemical Compositions ( in %) Of  304L & 304H Stainless Steel 

Grade

C

N

Si

P

S

Cr

Mn

Ni

Fe

304L

0.03 max

0.10 max

0.75 max

0.045 max

0.030 max

18.0 - 20.0

2.0 max

8.0 - 12.0

Remainder

304H

0.04 - 0.10

0.10 max

0.75 max

0.045 max

0.030 max

18.0 - 20.0

2.0 max

8.0 - 10.5

Remainder

 

Mechanical Properties Of  304L & 304H Stainless Steel 

Grade

Tensile Strength (ksi)

0.2% Yield Strength (ksi)

Elongation% in 2 inches

304L

70

25

40

304H

75

30

40

Alloy 304H has general corrosion resistance similar to 304L. It opposes atmospheric corrosion, just as, reasonably oxidizing and reducing environments. Because of its high carbon content, Alloy 304H is dependent upon carbide precipitation in the heat affected zone of welds.

 

Steeloncall
18 Dec, 2019
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