303

Product Name: 303 Stainless Steel

Standard: GB/T 1220

303 stainless steel is an austenitic type of easy-to-cut, wear-resistant, and acid-resistant steel. To enhance the properties of this steel, up to 0.60% molybdenum can be added, making it resistant to ablation.

After annealing and stress relief, the mechanical properties of 303 stainless steel are: tensile strength 515MPa, yield strength 205MPa, elongation 40%. The standard hardness of stainless steel 303 is HRB 90-100, HRC 20-25, note: HRB100 = HRC22.9.

303 is a free-cutting stainless steel containing sulfur and selenium, used primarily in applications that require good free-cutting properties and high surface finish. The 303 stainless steel enhances cutting performance and resistance to high-temperature galling. *It is suitable for automatic lathes, bolts, and nuts.

C :≤0.15%

Si :≤1.00%

Mn :≤2.00%

P :≤0.20%

S :≥ 0.15%

Cr :17.00-19.00（%）

Ni :8.00-10.00（%）

Mo :≤0.6%

Tensile Strength σb (MPa): ≥520

Condition Yield Strength σ0.2 (MPa): ≥205

δ5 (%) elongation: ≥40

Section shrinkage rate ψ (%): ≥50

Hardness: HB≤187HB; HRC≤90HRB; HV≤200HV

Heat Treatment Specifications: Austenitize at 1010-1150°C and rapidly quench.

Metallographic Structure: Characterized by an Austenitic microstructure.

Editor

Graded

① Standard GB ② Industry Standard YB ③ Local Standard ④ Corporate Standard Q/CB

Categories

① Product Standards ② Packaging Standards ③ Method Standards ④ Basic Standards

Standard Level

Y Level: International Level; I Level: General International Level; H Level: Domestic Level

National Standard

GB1220-84 Stainless Steel Bars (Grade I) GB4241-84 Stainless Steel Welding Plates (Grade H) GB4356-84 Stainless Steel Welding Plates (Grade I) GB1270-80 Stainless Steel Tubing (Grade I) GB12771-91 Stainless Steel Welded Pipes (Grade Y) GB3280-84 Stainless Steel Cold Rolled Sheets (Grade I) GB4237-84 Stainless Steel Hot Rolled Sheets (Grade I) GB4239-91 Stainless Steel Cold Strips (Grade I)