Chromium Iron Pipe
High chromium cast iron pipe for severe abrasion and slurry conveying applications.
40CrNiMoA, 4340, and SNCM439 are all types of high-strength alloy steel that contain similar chemical compositions, making them somewhat interchangeable for certain applications.
Chrome-Moly low alloy steel series contains 0.5%–9% Cr, 0.5%–1% Mo, and less than 0.20% C. 40CrNiMoA, 4340 and SNCM439 are low alloy chromoly steel grades specified by different standards. 40CrNiMoA is a Chinese chromium-molybdenum high-strength steel with good hardenability and toughness. 4340 and SNCM439 are specified by AISI (USA) and JIS (Japan), respectively. In most cases, they can be used interchangeably unless otherwise noted or applied for special purposes. Their main differences lie in chemical composition, as shown below:
| Standards | GB | AISI | JIS |
|---|---|---|---|
| Material | 40CrNiMoA | 4340 | SNCM439 (SNCM8) |
| C (%) | 0.37 – 0.44 | 0.38 – 0.43 | 0.36 – 0.43 |
| Si (%) | 0.17 – 0.37 | 0.15 – 0.35 | 0.15 – 0.35 |
| Mn (%) | 0.50 – 0.80 | 0.60 – 0.80 | 0.60 – 0.90 |
| P (%) | ≤ 0.025 | ≤ 0.035 | ≤ 0.030 |
| S (%) | ≤ 0.025 | ≤ 0.040 | ≤ 0.030 |
| Cr (%) | 0.60 – 0.90 | 0.70 – 0.90 | 0.60 – 1.00 |
| Ni (%) | 1.25 – 1.65 | 1.65 – 2.00 | 1.60 – 2.00 |
| Mo (%) | 0.15 – 0.25 | 0.20 – 0.30 | 0.15 – 0.30 |
This material is used for components requiring high tensile strength and good wear resistance, such as heavy-duty axles, shafts, gears, spindles, pins, studs, bolts, couplings, sprockets, pinions, torsion bars, and connecting rods. It is widely applied in petrochemical, automotive, steam power equipment, and other high-temperature service environments.
| C (%) | Si (%) | Mn (%) | P (%) | S (%) | Cr (%) | Ni (%) | Cu (%) | Mo (%) |
|---|---|---|---|---|---|---|---|---|
| 0.37 – 0.44 | 0.17 – 0.37 | 0.50 – 0.80 | ≤ 0.025 | ≤ 0.025 | 0.60 – 0.90 | 1.25 – 1.65 | ≤ 0.25 | 0.15 – 0.25 |
| Yield Strength Rp0.2 (MPa) |
Tensile Strength Rm (MPa) |
Impact Energy AKV (J) |
Elongation A (%) |
Impact Toughness | Reduction of Area ψ (%) |
Hardness |
|---|---|---|---|---|---|---|
| ≥ 835 (85) | ≥ 980 (100) | ≥ 78 | ≥ 12 | ≥ 88 (10) | ≥ 55 | ≤ 269 HBW |
SNCM439 is a nickel-chromium-molybdenum tempered alloy structure steel. SNCM439 boasts superior strength, hardness, wear resistance and toughness.
Its hardenability is slightly higher than that of 40Cr steel, with a critical quenching diameter in oil of up to 18 ~ 33mm. It is an ideal replacement for 40Cr steel. Once normalised, it displays excellent machinability, cold drawing, rolling, tapping, forging and heat treatment characteristics. At high temperatures, the decarburisation tendency and quenching deformation tendency are minimal, although the tempering property is not as robust as that of 40Cr steel. SNCM439 steel rod is typically employed in tempered conditions and can withstand temperatures between -20 and 425°C.
SNCM439 is widely used as a high-toughness alloy structural steel.
| EU/EN | INTER/ISO | USA/AISI | JAPAN/JIS | GERMANY/DIN | CHINA/GB | FRANCE/AFNOR | ENGLAND/BS |
|---|---|---|---|---|---|---|---|
| -- | -- | 4340 9840 |
SNCM439 | -- | 40CrNiMoA 45CrNiMoVA |
-- | -- |
*This comparison table is for reference only. Standards and grades vary slightly by country. Please refer to the database for detailed specifications.*
The chemical composition of SNCM439 is as follows:
| C (%) | Si (%) | Mn (%) | P (%) | S (%) | Ni (%) | Cr (%) | Mo (%) | Cu (%) |
|---|---|---|---|---|---|---|---|---|
| 0.36 – 0.43 | 0.15 – 0.35 | 0.60 – 0.90 | ≤ 0.030 | ≤ 0.030 | 1.60 – 2.00 | 0.60 – 1.00 | 0.15 – 0.30 | ≤ 0.30 |
| Property | Value |
|---|---|
| Tensile strength (kgf/mm²) | ≥ 100 |
| Yield strength (kgf/mm²) | ≥ 85 |
| Elongation (%) | ≥ 16 |
| Reduction of area (%) | ≥ 45 |
| Impact value (J/cm²) | ≥ 8 |
| Hardness (HB) | 293 – 352 |
SNCM439 has excellent hardenability and can be heat-treated to achieve high hardness and strength. It is commonly used in gears, shafts, and other components requiring high strength, wear resistance, and fatigue resistance.
Compared with other steels, SNCM439 offers superior mechanical performance at elevated temperatures, making it suitable for high-temperature applications.
Overall, SNCM439 is a durable and versatile alloy steel widely used in automotive, aerospace, marine, and construction industries.
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