What is the difference between 304H and 304 stainless steel

I'll give you the most accurate explanation.

304H is mainly a carbon element compared to 304 and 304L.

The content is different. 304H has a higher carbon content than 304, and 304L has a lower carbon content than 304.

The carbon content of 304 is within.

The carbon content of 304h is between.

304L carbon content.

There is basically no difference in the content of other elements.

304H features: stainless heat-resistant steel, with good bending, welding process performance, corrosion resistance, high lasting strength and structural stability, cold deformation ability is very good. The operating temperature can reach up to 650 °C, and the antioxidant temperature can reach up to 850°C

Type 304L material has better braiding and welding characteristics due to its low carbon content.

Hope to be able to answer your questions.

The difference between carbon content and hardness.

304H austenitic stainless heat-resistant steel, good corrosion resistance and welding performance, good thermal strength.

1. 304H corresponding grades: 1. National standard GB-T standard: digital grade:

S30409, new grade: 07CR19Ni10, old grade: one, 2, American standard:

ASTMA Standard: S30409, SAE Standard: , UNS Standard:

304H, 3, Japanese standard JIS standard: SUS304, 4, German standard DIN standard: European standard EN standard:

x6crni18-10，x7crni18-19", French NF standard: , British BS standard: X6CRNI18-11, Sweden:

NTR Standard: AISH.

2. 304H chemical composition: carbon C: , silicon Si:, manganese Mn: , phosphorus P: , sulfur S: , chromium Cr:, nickel Ni:, molybdenum Mo:, nitrogen N:—, copper Cu:—, other elements:

3. 304H physical properties: density density (20).

kg/dm3:", melting point :—specific heat capacity (0 100 ) kg (", thermal conductivity w (

100℃-:"", thermal conductivity w (, coefficient of linear expansion.

10-6/k)

0~100℃:"", coefficient of linear expansion (10-6 K), resistivity (20).

.mm2/m):"", longitudinal modulus of elasticity.

20℃）/gpa:", Magnetic: None.

4. 304H mechanical properties: Delivery status:"Bar cutting processing solution treatment, hot pressure processing without solution treatment", Solid solution pickling of plates, Tensile strength (rm mpa):

480, Elongation strength (:177, elongation a %: 40, section shrinkage (z %):

60。304H application field: mainly used for large boiler superheater, reheater, steam pipeline, petrochemical heat exchanger.

1. In fact, there is not much difference, 304 is 1cr18ni9. The mechanism of stainless steel rust prevention is that the alloying elements form a dense oxide film, which isolates oxygen contact and prevents further oxidation. It is true that 304A meets the requirements of 304, and is better than 304, as if it can automatically replace 304, but from the mechanical properties in Table 2, it can be seen that the strength of 304 is higher than that of 304A, when it is designed according to 304, it will be replaced by 304L, which will cause insufficient strength;

2. In addition, in China's GB150-1998 pressure vessel standard, it is stipulated that when the use temperature of austenitic stainless lead steel is higher than 525, the carbon content in the steel should not be less than. As can be seen from Table 1, 304 can be used in most departments, but 304A cannot be used for segmentation.

Summary. There are three main differences between 304 stainless steel and 304L: 1. Different chemical compositions

Carbon content of 304 stainless steel c; Carbon content of 304L stainless steel. 2. Different mechanical properties: 304 stainless steel tensile strength 525MPa; 304L stainless steel tensile strength **Different:

304L stainless steel of the same specification and origin is generally 200-500 yuan higher than 304**. To sum up, 304 and 304L stainless steel generally cannot be used interchangeably, if there is a substitute, we must understand the use scenarios of stainless steel and its related characteristics.

There are three main differences between 304 stainless steel and 304L: 1. Different chemical compositions: the carbon content of 304 stainless steel c; Carbon content of 304L stainless steel.

2. Different mechanical properties: 304 stainless steel tensile strength 525MPa; The tensile strength of 304L stainless steel is different: the 304L stainless steel of the same specification and origin is generally 200-500 yuan higher than that of 304.

To sum up, 304 and 304L stainless steel generally cannot be used interchangeably, if there is a substitute, we must understand the use scenarios of stainless steel and its related characteristics.

Hope it helps.

304H is 304 heat-resistant steel.

Heat-resistant steel can be divided into two categories according to its properties: oxidation-resistant steel and heat-strong steel. Anti-oxidation steel is also referred to as non-leather steel. Thermally strong steel refers to steel that has good oxidation resistance at high temperatures and has high high-temperature strength.

Heat-resistant steel can be divided into austenitic heat-resistant steel, martensitic heat-resistant steel, ferritic heat-resistant steel and pearlitic heat-resistant steel according to its normalized structure.