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Help CenterHigh-toughness 37simn2mov Low-temperature-resistant Round Steel, High-strength 30cr2ni2moa Alloy Steel Bars, Available for Cutting and Retail
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In harsh working conditions such as petrochemical, mining machinery, and heavy equipment, brittle fracture of materials in low-temperature environments has been a major long-term hidden danger in the industry. When traditional alloy steels are used at low temperatures below -40°C, their impact toughness drops sharply, often leading to sudden failure of components and causing safety accidents. At the same time, the contradictory requirements of high-load components for strength and toughness - the higher the strength, the lower the toughness - have always been a difficult point in material selection. Liaocheng Jincheng Yangming Special Steel Co., Ltd., with years of experience in special steel production, has specifically launched high-toughness 37SiMn2MoV low-temperature-resistant round steel and high-strength 30Cr2Ni2MoA alloy steel bars. By optimizing the alloy ratio and heat treatment process, it significantly improves the low-temperature impact toughness while ensuring high strength, effectively solving the industry pain points of low-temperature brittle fracture and insufficient strength. The company is located in Liaocheng City, Shandong Province, and mainly deals in special steels such as precipitation-hardening steel, duplex steel, and heat-resistant steel. Its products are widely used in industries such as petroleum, chemical, shipbuilding, nuclear engineering, aerospace, mining, textile, and construction machinery. It has won the trust of customers with a practical attitude and the principle of honesty.
▍Working Mechanism and Product Features
- 37SiMn2MoV Low-Temperature-Resistant Round Steel: Through the composite alloying of silicon, manganese, molybdenum, and vanadium, it refines the grains and strengthens the matrix, enabling it to maintain a longitudinal impact absorption energy (typical value) of ≥47J in a -50°C environment, and at the same time, the yield strength is ≥835MPa. This material is particularly suitable for manufacturing drilling tools, petroleum valve bodies, mining machinery structural parts, etc. that work in extremely cold climates.
- 30Cr2Ni2MoA Alloy Steel Bar: Using the synergistic strengthening of chromium, nickel, and molybdenum elements, after quenching and tempering treatment, a uniform tempered sorbite structure is obtained. The hardness can reach HB 240~290, and the tensile strength is ≥980MPa. It has both good wear resistance and fatigue life. It is commonly used for key stressed parts such as high-strength bolts, drive shafts, and gears.
- Both products can provide cutting and retail services, supporting customers to cut materials to length according to actual needs, reducing material waste and processing costs.
▍Technical Specification Parameters (Typical Values, for Reference Only)
| Project | 37SiMn2MoV | 30Cr2Ni2MoA |
| Diameter Range (mm) | 20~300 | 20~350 |
| Delivery status | Hot-rolled/forged, annealed or quenched and tempered | Hot-rolled/forged, annealed or quenched and tempered |
| Yield strength (MPa) | ≥835 | ≥785 |
| Tensile strength (MPa) | ≥980 | ≥980 |
| Elongation after fracture (%) | ≥12 | ≥12 |
| Impact energy at -40℃ (J) | ≥47 | ≥40 |
| Applicable temperature range | -50℃ ~ +300℃ | -40℃ ~ +350℃ |
▍Detailed description of product advantages
- High toughness and low-temperature performance: Through the microalloying of vanadium and the controlled rolling and controlled cooling process, the low-temperature impact toughness of 37SiMn2MoV is more than 30% higher than that of ordinary steel of the same strength level, meeting the requirements for use in extremely cold regions.
- High strength and wear resistance: After quenching and high-temperature tempering, 30Cr2Ni2MoA can obtain high strength and good comprehensive mechanical properties, especially suitable for transmission parts with frequent start-stop and heavy-load impact.
- Flexible cutting and retail: Provide on-demand fixed-length cutting services, the length tolerance can be controlled within ±2mm, support single-piece or small-batch retail, reducing customers' material preparation costs.
- Strict quality control: Chemical composition analysis and mechanical property testing are carried out on each batch of raw materials to ensure that the products meet the requirements of the technical agreement and provide quality certificates.
- Wide range of application scenarios: The two types of steel have been successfully applied in key components of polar oil rigs at -45℃, liquefied natural gas (LNG) storage and transportation equipment at -60℃, and large-tonnage press modules and other harsh working conditions.
▍Trust Endorsement and Company Advantages
Since its establishment, Liaocheng Jincheng Yangming Special Steel Co., Ltd. has always adhered to the business principle of seeking truth from facts and honesty, and has accumulated a good reputation in the industry. The company's technical team can assist customers in material selection analysis, provide heat treatment suggestions and usage guidance. At present, our high-toughness and low-temperature-resistant round steel has been supplied in batches to many northern heavy machinery enterprises, and the feedback shows excellent low-temperature impact stability. The company can provide support documents such as CCS classification society material certification, composition test reports, and third-party performance test reports (specific certifications need to be provided according to customer requirements).
If you are looking for alloy steel materials with both low-temperature toughness and high strength, or have any questions about your existing material selection, welcome to contact our technical team. We can recommend the most suitable steel grade and heat treatment state according to your actual working conditions (minimum service temperature, stress form, cross-sectional size), and provide free sample test bars. We look forward to in-depth communication with you and assisting you in solving material problems.
FAQ – Common Questions from Buyers
- Q: Can 37SiMn2MoV round steel be used at -60℃? A: This material usually guarantees an impact toughness of ≥47J at -50℃. The impact value will decrease at -60℃ but is still higher than that of ordinary low-alloy steels. If it is to be used at -60℃ or below for a long time, it is recommended to conduct a more rigorous low-temperature impact test for confirmation, or choose a low-temperature-resistant grade with a higher Ni content.
- Q: What are the differences between 30Cr2Ni2MoA and 40CrNiMoA? A: 30Cr2Ni2MoA has a lower carbon content (about 0.27%~0.34%), slightly better weldability, and higher hardenability, which is suitable for large-section quenched and tempered parts; while 40CrNiMoA has a higher carbon content (about 0.37%~0.44%), higher strength but slightly lower toughness. The specific material selection needs to be combined with the cross-sectional size and strength requirements.
- Q: Do you provide round steel in black skin state or turned state? A: By default, we provide hot-rolled black skin state with oxide scale on the surface. If you need turned or ground state (higher dimensional accuracy and can be directly processed), you can indicate it when placing the order, and we can provide subsequent processing services.
- Q: What is the minimum order quantity for cutting and retail? A: The minimum order is one piece. The length can be cut from 100mm, and round steel with a diameter of 20~100mm can be cut to length according to customer requirements. Small batch orders are also accepted, but corresponding cutting and packaging fees need to be borne.
- Q: Can you provide the chemical composition report of the material? A: Yes. Each batch of goods will be accompanied by a material certificate, which includes the furnace number, chemical composition (C, Si, Mn, P, S, Cr, Ni, Mo, V, etc.) and mechanical property data. If you need a third - party inspection report (such as SGS), we can send the samples for testing on your behalf, and the cost will be charged separately.
- Q: Are these two types of materials suitable for welding? Do they need pre - heating before welding? A: Both 37SiMn2MoV and 30Cr2Ni2MoA belong to medium - carbon alloy steels, and their weldability is average. It is recommended to pre - heat them to 200~300℃ before welding, cool them slowly after welding and conduct stress - relief annealing in time. For the welding of large - area structural parts, low - hydrogen electrodes should be used and the heat input should be controlled.
- Q: Does your company support exports? What are the packaging methods? A: Yes, we support exports and can handle commodity inspection and fumigation certificates. Round steel is usually bundled with iron wires or steel strips and wrapped with waterproof woven cloth. For export products, wooden boxes or iron frames can be customized for packaging.
- Q: How do you ensure the batch stability of the low - temperature impact performance of the materials? A: We strictly control the smelting composition (especially the S and P content ≤0.015%), optimize the heat treatment process parameters, and conduct sampling tests on the low - temperature impact performance of each batch to ensure that the performance fluctuation is within a reasonable range.
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