Baimaoxing
Baimaoxing
Explore our precision-manufactured carbon steel, brass, titanium, and aluminum structural products exported worldwide.
An authoritative technical whitepaper breaking down chemical kinetics, heat treatment response, mechanical properties, and OEM custom manufacturing tolerances.
SCM440 steel pipe is a high-strength chromium-molybdenum alloy steel seamless pipe standardized under JIS G4053. Globally recognized for its exceptional hardenability, elevated fatigue strength, high thermal stress tolerance, and superb impact toughness, SCM440 (equivalent to AISI 4140 / SAE 4140 in North America, 42CrMo4 / 1.7225 under European EN 10083 standards, and 42CrMo under GB/T 3077 standards) forms the structural backbone of high-stress mechanical engineering worldwide.
When specified by global Procurement Managers and Mechanical Design Engineers, OEM SCM440 seamless steel pipes are subjected to rigorous heat treatments—specifically Quenching and Tempering (Q+T)—to yield optimal balance between tensile strength, yield ratio, and microstructural ductility. The inclusion of Molybdenum (Mo) prevents temper brittleness while enhancing elevated temperature endurance, and Chromium (Cr) delivers uniform cross-sectional hardenability even in heavy-wall steel pipes exceeding 80mm thickness.
To ensure total trace chemical integrity for structural integrity in automotive drive shafts, petroleum drilling rigs, and heavy hydraulic systems, OEM SCM440 manufacturing adheres strictly to tight chemical parameters. The following matrix illustrates the equivalent international alloy standards:
| Standard Specification | Grade Equivalent | Carbon (C) | Chromium (Cr) | Molybdenum (Mo) | Manganese (Mn) | Silicon (Si) | Sulfur (S) / Phos (P) |
|---|---|---|---|---|---|---|---|
| JIS G4053 (Japan) | SCM440 | 0.38 - 0.43% | 0.90 - 1.20% | 0.15 - 0.30% | 0.60 - 0.90% | 0.15 - 0.35% | ≤ 0.030% / ≤ 0.030% |
| ASTM A29 / AISI (USA) | AISI 4140 / SAE 4140 | 0.38 - 0.43% | 0.80 - 1.10% | 0.15 - 0.25% | 0.75 - 1.00% | 0.15 - 0.35% | ≤ 0.040% / ≤ 0.035% |
| EN 10083 / DIN (EU) | 42CrMo4 / 1.7225 | 0.38 - 0.45% | 0.90 - 1.20% | 0.15 - 0.30% | 0.60 - 0.90% | ≤ 0.40% | ≤ 0.035% / ≤ 0.025% |
| GB/T 3077 (China) | 42CrMo | 0.38 - 0.45% | 0.90 - 1.20% | 0.15 - 0.25% | 0.50 - 0.80% | 0.17 - 0.37% | ≤ 0.030% / ≤ 0.030% |
When processed by **Shandong Baimaoxing Iron and Steel Co., Ltd.** via precision heat treatment lines, OEM SCM440 steel pipes achieve extraordinary mechanical specs designed for severe dynamic load cycles:
| Mechanical Parameter | Standard Specification Range (Q+T) | OEM Custom Precision Capability |
|---|---|---|
| Tensile Strength (Rm) | ≥ 1080 MPa (156,000 PSI) | Up to 1250 MPa upon request |
| Yield Strength (ReH) | ≥ 930 MPa (135,000 PSI) | ≥ 1000 MPa tailored heat treatment |
| Elongation at Break (A5) | ≥ 12% | 14% - 18% optimized grain structure |
| Impact Toughness (Charpy V-Notch Akv) | ≥ 63 Joules (+20°C) | ≥ 45 Joules at -40°C Low Temp Grade |
| Surface Hardness (HB / HRC) | 280 - 320 HBW / HRC 28 - 34 | Induction Surface Hardened up to HRC 55-60 |
From deep-sea oil exploration to precision automotive gearshafts, SCM440 seamless pipes provide unmatched torsional resistance and anti-fatigue performance.
SCM440 seamless cold-drawn tubes undergo internal honing to achieve an inner surface roughness of Ra 0.2 - 0.4 µm. Used extensively in hydraulic excavators, crane boom cylinders, and heavy mining machinery where oil pressures exceed 35 MPa without cylinder wall expansion.
High-speed transmission drive shafts, CV axle tubes, and hollow steering knuckles demand high torsional yield points. SCM440 seamless pipes significantly reduce rotating inertia while maintaining structural strength up to 1080 MPa.
In deep offshore oil drilling, drill collars, API casing couplings, and mud motor housings require superior resistance to hydrogen sulfide (H2S) stress corrosion cracking. Our SCM440/42CrMo4 tubing complies with NACE MR0175 standards.
Renewable wind energy main shafts and pitch bearings leverage cold-drawn or hot-forged thick-wall SCM440 pipes. High fatigue endurance ensures a 25-year structural service life under extreme fluctuating wind loads.
Ideal for deep-hole drilling, tapping, external grinding, and spline cutting. Excellent chip-breaking behavior during high-speed turning cuts cycle time by 20% compared to standard carbon steels.
Utilized in structural landing gear struts, high-pressure gas cylinders, and artillery barrels requiring ultra-clean steel with low inclusion ratings compliant with ASTM E45 Method A.
Located in Liaocheng City, Shandong Province—China's premier steel manufacturing hub—our factory integrates direct raw billet sourcing, state-of-the-art cold drawing, heat treatment, and precision testing.
Shandong Baimaoxing Iron and Steel Co., Ltd. is located in Liaocheng City, Shandong Province, China. We are a large steel supplier specializing in research and development, processing, sales, and technical services. Our business covers steel pipes, steel plates, round bars, steel coils, angle bars, flat bars, I-beams, stainless steel plates, stainless steel coils, stainless steel pipes, copper plates, and copper bars, Copper tubes, aluminum plates, aluminum tubes, aluminum coils, aluminum rods, titanium plates, titanium tubes, titanium coils, titanium rods, galvanized steel coils, PPGI, etc. Baimaoxing adopts a scientific management model, and its products are widely used in industries such as aerospace, military equipment, petrochemicals, automotive parts, shipbuilding, precision machining, transportation and rail, engineering machinery, electrical equipment, packaging machinery, etc.
We provide customers with steel and its deep processed products, as well as customized, specialized, and one-stop services ranging from cold drawing, heat treatment (Normalizing, Annealing, Q+T), cutting to fixed lengths (1m to 12m), chamfering, and anti-corrosion coating.
Tonghui / Baimaoxing has a large team of outstanding metallurgical engineers and senior technicians with decades of specialized work experience in alloy steel pipe seamless hot rolling, cold drawing, and dimensional control.
The company has obtained ISO9001:2015 certification, and products comply with EU ROHS standards with optional third-party SGS, TUV, BV, or ABS inspection reports provided with Mill Test Certificates (EN 10204 3.1/3.2).
Ensuring microstructural uniformity, zero internal voids, and dimensional accuracy for OEM global procurement orders.
We source ultra-clean continuous casting or forged alloy billets from top-tier steel mills (e.g., Baosteel, Shagang). Billets undergo strict spectral analysis to verify chemical elements prior to hot piercing.
Seamless hollow pipes are formed using multi-pass mandrel rolling. For high-precision hydraulic barrel applications, cold drawing on 500-ton hydraulic draw benches reduces outer diameter and wall tolerances to ±0.05mm.
Computer-controlled furnace lines quench SCM440 pipes in polymer/oil media at 840°C–860°C, followed by high-temperature tempering at 560°C–620°C to form fine tempered martensite microstructures.
100% of SCM440 pipes pass Ultrasonic Testing (UT) according to SEP 1921 Class C/c or EN 10246-7, along with Eddy Current Testing (ET) to ensure zero longitudinal or transverse crack defects.
Deep-hole BTA boring and vertical honing machines process inner diameters from 30mm up to 500mm, delivering mirror-finish inner surface roughness (Ra ≤ 0.2 µm) for piston sealing rings.
Pipes are end-capped with plastic protectors, wrapped in anti-rust VCI paper, oil-coated, and bundled with high-tensile steel straps for container shipping or breakbulk ocean freight.
Discover our complete portfolio of OEM non-ferrous and alloy steel tube and bar solutions.
We maintain full inventory and customized rolling capacities across Carbon Steel, Stainless Steel, Copper, Aluminum, Titanium, and Coated Steel Products.
High-quality round bars (4140, 4130, 4340, 1045, Q235B), structural plates, hot-rolled coils (Q195-Q345), and seamless pressure pipes (ASTM A53 / A106 Gr.B).
Corrosion-resistant 201, 304, 304L, 316, 316L, 321, and 410 grade round bars, angle irons, flat bars, and industrial seamless tubes conforming to ASTM A479.
High conductivity T1/T2/T3/TU1 pure copper rods, C122 seamless tubing (ASTM B280), wear-resistant C28000/C26000 brass plates, and multi-model refrigeration tubes.
Industrial aluminum sheets (1050 to 7075), high-strength GR1/GR2/GR5 titanium bars & pipes, alongside pre-painted galvanized steel coils (PPGI/PPGL).
Direct technical answers addressing engineering specs, heat treatment options, minimum order quantities, and custom machining capabilities.