SUS430 And 304 Stainless Steel What Is The Difference Between These Two Specifications, Which One Can Withstand Higher Temperature? How Much Higher Is It?

SUS430 and 304 stainless steel What is the difference between these two specifications, which one can withstand higher temperature? How much higher is it?

 

430 martensitic stainless steel. The temperature is higher, about 600 degrees.

304 austenitic stainless steel.

sus430 has the characteristics of corrosion resistance, mechanical properties and thermal conductivity, but it is brittle at room temperature and has stainless property in the atmosphere, water evaporator and other media, but the stainless property is insufficient when the medium contains high chloride ions. It has good corrosion resistance in oxidizing acid solutions, especially in dilute HNO3. Thin HNO3 related parts can be made. It can also make oxidation resistant parts below 900 degrees, scatters, furnace parts, oil nozzles, etc. Because its brittle transition temperature is above room temperature and sensitive to notch, it is not suitable for making parts of load bearing equipment below room temperature.

1, sus430 corresponding brand: 1, national standard GB-T standard: digital brand: S11710, new brand: 10Cr17, old brand: 1Cr17,2, American standard: ASTMA standard: S43000, SAE standard: 1, UNS standard: 1, 3, Japanese standard JIS standard: sus430, 4, German standard DIN standard: 1.40165, European standard EN standard: X6Cr17

sus430 chemical composition: (1) Carbon C: ≤0.12, (2) Silicon Si: ≤1.00, (3) Manganese Mn: ≤1.00, ⑷ Phosphorus P: ≤0.040, (5) sulfur S: ≤0.030, chromium Cr: 16.00 ~ 18.00, nickel Ni: allowed plus 0.60, (8) molybdenum Mo: -, nitrogen N: -, (10) Copper Cu: --, 11 Other elements: --.

Third, sus430 physical properties: ① Density density (20℃)

/ kg/dm3:7.7, (2) / ℃ melting point: 1480 ~ 1508, (3) heat capacity (0 ~ 100 ℃)/kg/kg. (k) : 0.46, (4) thermal conductivity/w/(m.k)

100℃-:26,⑸ Thermal conductivity /w/(m.k)

500 ℃ - :

-,⑥ linear expansion coefficient

/(10-6/k)

0~100℃:10.5,⑦ linear expansion coefficient /(10-6/k)

0 ~ 577 ℃ :

11.9,⑧ Resistivity (20℃)

/ (ω.mm2 /m):0.6,⑨ longitudinal elastic modulus

(20℃) /GPa:200, ⑩ Magnetic: Yes.

Fourth, sus430 mechanical properties: (1) delivery status: bar solid solution treatment, plate solid solution pickling, (2) tensile strength (RM/MPa) : 450, (3) extension strength (Rp0.2/MPa) : 205, ⑷ elongation A/% : 22, cross-section shrinkage (Z/%) : 50.

Fifth, sus430 heat treatment: ① hardness HBW≤ : annealing 183, hardness HRB≤ : 83, ② heating temperature: 680~820, ③ heating method: air cooling or slow cooling.

sus430 application field: mainly used for the production of HNO3 chemical equipment, such as absorption tower, heat exchanger, storage tank, etc., thin plate is mainly used for building materials, daily necessities, automotive decorations, etc., for oxidation parts below 900 degrees, scatter, furnace parts, oil nozzles and so on. Although sus430 material tube is a mature material, but sus430 material tube application field range of challenges are constantly changing, those in the sus430 material tube strength, corrosion resistance and cost control have higher requirements for the process and quality of sus430 material tube has higher requirements.