Description
| Stainless Steel – SUS403, UNS S40300, 1.4024 |
| Chemical Formula |
| Fe, <0.15% C, 11.5-13.5% Cr, >0.75% Ni, <1.0% Mn, <0.5% Si, <0.04% P, <0.03% S |
SS403 is the basic martensitic stainless steel; like most non-stainless steels it can be hardened by a “quench-and-temper” heat treatment. It contains a minimum of 11.5 per cent chromium, just sufficient to give corrosion resistance properties. It achieves maximum corrosion resistance when it has been hardened and tempered and then polished. SUS403 is a general purpose grade often supplied in the hardened, but still machinable condition, for applications where high strength and moderate heat and corrosion resistance are required.
| AISI Type 403 |
| Type | Martensitic Stainless Steel | ||
| Designations | France: AFNOR Z 12 C 13M Germany: DIN 1.4024 Japan: JIS SUS 403 , JIS SUS 416 United Kingdom: B.S. 420 S 29 , B.S. En. 56 B United States: AMS 5611 , AMS 5612 , ASTM A176 , ASTM A276 , ASTM A314 , ASTM A473 , ASTM A479 , ASTM A511 , ASTM A580 , FED QQ-S-763 , MIL SPEC MIL-S-862 , SAE 51403 , SAE J405 (51403) , UNS S40300 |
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| Composition | |||
| Element | Weight % |
| C | 0.15 |
| Mn | 1.00 |
| Si | 0.50 |
| Cr | 11.5-13.0 |
| P | 0.04 |
| S | 0.03 |
Mechanical Properties
| Properties | Metric | Imperial |
| Tensile strength | 485 MPa | 70300 psi |
| Yield strength (@strain 0.200 %) | 310 MPa | 45000 psi |
| Fatigue Strength (annealed, @diameter 25mm/0.984 in) | 275 MPa | 39900 psi |
| Shear modulus (typical for steel) | 76.0 GPa | 11000 ksi |
| Elastic modulus | 190-210 GPa | 27557-30458 ksi |
| Poisson’s ratio | 0.27-0.30 | 0.27-0.30 |
| Elongation at break (in 50 mm) | 25.00% | 25.00% |
| Izod impact (tempered) | 102 J | 75.2 ft-lb |
| Hardness, Brinell (converted from Rockwell B hardness) | 139 | 139 |
| Hardness, Knoop (converted from Rockwell B hardness) | 155 | 155 |
| Hardness, Rockwell B | 80 | 80 |
| Hardness, Vickers (converted from Rockwell B hardness) | 153 | 153 |
Corrosion Resistance
SUS403 resists dry atmosphere, fresh water, mild alkalies and acids, food, steam and hot gases. Must be hardened for maximum heat and corrosion resistance. Performance is best with a smooth surface finish. Less corrosion resistant than the austenitic grades and also less than 17% chromium ferritic alloys such as SUS430.
| Applications
Typical applications include: · Bolts & Nults · Screws · Bushings · Pump and valve parts and shafts · Steam and gas turbine parts · Petroleum fractionating towers · Mine ladder rungs |
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