Stainless Steel 304 304L 304H Pipes Tubes

Stainless Steel 304 304L 304H Pipes Tubes

What is the difference between 304, 304H and 304L?

In fact, according to the content of chromium nickel is 304 stainless steel, the composition is containing 18% chromium (Cr), 8% nickel (Ni), but the main difference is the difference in carbon content.

Chemical composition (%) table of 304, 304L and 304H

type	C	Mn	P	S	Si	Cr	Ni	N
304	0.08	2.00	0.045	0.030	0.75	18.00-20.00	8.00-10.50	0.10
304L	0.030	2.00	0.045	0.030	0.75	18.00-20.00	8.00-12.00	0.10
304H	0.04-0.10	2.00	0.045	0.030	0.75	18.00-20.00	8.00-10.50

304L is an ultra-low carbon stainless steel, the carbon content is reduced to less than 0.03%, which can avoid intergranular corrosion, and the effect of stress corrosion resistance is stronger than 304 in theory, but the effect is not obvious in practical applications. The purpose of reducing carbon and adding titanium is the same, but the 321 smelting cost of titanium is higher, the molten steel is thick, and the price is more expensive.

The H in 304H refers to high temperature, high carbon content is the guarantee of high temperature strength, GB150 requires austenitic steel used above 525 degrees, the carbon content is not less than 0.04%, carbide is the strengthening phase, especially the high temperature strength is better than pure austenite.

Among the three, the highest carbon content is 304H, the lowest carbon content is 304L, and the carbon content of 304 stainless steel is between the two. The higher the carbon content of stainless steel, the poorer the corrosion resistance and the easier it is to rust. The difference in carbon content also leads to its price will be different, or the use of different requirements are different.

Mechanical properties table of 304, 304L, 304H

type	Tensile strength	Yield strength	50mm elongation	hardness Brinell	hardness  Lorsch	Cold bending
304	≥515	≥205	≥40	≥201	≥92
304L	≥485	≥170	≥40	≥201	≥92
304H	≥515	≥205	≥40	≥201	≥92

Product Application

production flow

 

Selective Surface Finish

Shape

 

Quality Control

Packaging&Delivery

Hot Tags: stainless steel 304 304l 304h pipes tubes, China stainless steel 304 304l 304h pipes tubes manufacturers, suppliers, factory, Calibrate Steel Rod, High Strength S690QL1 Steel, 201 Stainless Steel Pipe, Seamless Stainless Steel Pipe, 65Mn Spring Steel Round Bar, 309S Stainless Steel Sheet