1.4731 Martensitic Stainless Steel Bars and plates
It is a chromium-silicon-molybdenum martensitic valve steel, used after quenching and tempering. It contains molybdenum and silicon, and has creep resistance as well as excellent high-temperature oxidation resistance—its oxidation resistance is higher than that of 40Cr13 (4Cr13). In the environment of 750-800°C, it can form a dense and stable oxide film to effectively resist high-temperature oxidation attack, while also having high high-temperature strength and good hot strength.
Applications of 1.4731
In the automotive industry, it is often used to manufacture heat-resistant components of exhaust systems, such as exhaust manifolds, which can withstand the continuous scouring of high-temperature exhaust gas discharged from engines; in the field of machinery manufacturing, it is suitable for manufacturing high-temperature components such as boiler superheaters and nozzles.
Equivalent Grades and Commonly Used Specifications of 1.4731
| Steel Grade | Specification | Specification Name |
| 4Cr10Si2Mo / 40Cr10Si2Mo / S48140 | GB/T 1221 | Heat-resistant steel bars |
| GB/T 12773 | Valve steel and superalloy bars for internal combustion engines | |
| GJB 2294A | Specification for stainless and heat-resisting steel bars for aviation | |
| X40CrSiMo10-2/1.4731 | EN 10090 | Valve steels and alloys for internal combustion engines |
| SUH3 | JIS G 4311 | Heat-resistant steel bars and wires |
| 40Х10С2М/4Х10С2М/ЭИ107 | GOST 5632 | High-alloy steels and corrosion-proof, heat-resisting and high-temperature alloys grades |
| Produce as other form and size according to technical requirements are available. | ||
Typical Chemical Composition of 1.4731
|
Elements |
C | Si | Mn | P | S | Ni | Cr | Mo |
|
Contents% |
0.35~0.45 | 1.90~2.60 | ≤0.70 | ≤0.035 | ≤0.030 | ≤0.60 | 9.00~10.50 |
0.70~0.90 |
| Produce as other form and size according to technical requirements are available. | ||||||||
Typical Heat Treatment Condition and Mechanical Properties of 1.4731
|
Delivery Condition |
Mechanical Properties and Hardness of Heat-Treated Specimens | |||||
| Rp0.2/(N/mm2) | Rm/(N/mm2) | A/% | Zb/% | Aku2d/J |
HBW |
|
|
Annealed Condition |
/ | / | / | / | / | ≤269 |
| Q+T（1010℃-1040℃, oil; 720℃-760℃, air | ≥685 | ≥885 | ≥10 | ≥35 | / |
/ |
| Produce as other form and size according to technical requirements are available. | ||||||
Product Forms and Size Range of 1.4731
|
Product forms |
Size range |
|
Bars |
Diameter or side length: 5.0mm~1000mm |
| Flats |
thickness: 4.0mm~1000mm width: 300mm~2200mm |
| Produce as other form and size according to technical requirements are available. | |
