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Help Center35crnimov High-strength Alloy Structural Steel Bars Meeting National Military Standards, P35crnimov Cannon Shell Steel Pipe Forging
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Industry Pain Points and Solutions: In the fields of military industry, high-end equipment, and heavy machinery, key structural components (such as artillery barrels, missile casings, high-strength shafts, heavy-duty gears, etc.) have extremely strict requirements for the comprehensive mechanical properties of materials - they need extremely high tensile strength and yield strength, and must also maintain sufficient toughness and impact resistance to avoid brittle fracture. Traditional low-alloy steels often fail to meet both requirements. Under high strength, the toughness decreases significantly. The insufficient hardenability of large-section parts leads to uneven core performance, and the impact absorption energy drops sharply in low-temperature environments, seriously threatening the safety of equipment. Liaocheng Jincheng Yangming Special Steel Co., Ltd. has long been deeply involved in the field of special steel and deeply understands the above pain points. The 35CrNiMoV military standard high-strength alloy structural steel bars/pipes (P35CrNiMoV artillery shell steel pipes) we launched effectively solve the contradiction between high strength and high toughness through refined alloy composition design (Cr-Ni-Mo-V multi-element strengthening) and strictly controlled forging processes. The company is located in Liaocheng City, Shandong Province, and mainly deals in precipitation hardening steels, duplex steels, heat-resistant steels, corrosion-resistant alloys, etc. It has accumulated rich production and quality control experience in the field of special steel. For the 35CrNiMoV material, we use a special smelting process to ensure that the steel is pure and has little segregation. In the subsequent forging process, by precisely controlling the forging ratio and deformation temperature, the structure becomes more compact, the streamline distribution is reasonable, and the consistency of longitudinal and transverse properties is significantly improved. This material has been recognized by users in key applications such as artillery barrel manufacturing, military shafts, and molds.
Working Mechanism and Product Features: 35CrNiMoV belongs to the Cr-Ni-Mo-V series of alloy structural steels, and its strengthening mechanism mainly relies on solid solution strengthening, fine-grain strengthening, and precipitation strengthening. Among the alloying elements, nickel and chromium work together to significantly improve the hardenability and tempering resistance of the steel, enabling large-section parts to obtain uniform high strength after quenching and tempering. Molybdenum can effectively inhibit temper brittleness and refine the grains. The addition of vanadium further refines the austenite grains and forms fine and dispersed carbides, improving the high-temperature strength and fatigue resistance. The forging process breaks up the original coarse as-cast structure through hot plastic deformation, closes internal porosity and pores, and forms a fibrous structure arranged along the main deformation direction, thereby greatly improving the mechanical properties of the material in the stress direction. The core features of the product include:
- High strength and high toughness matching: The typical tensile strength is ≥1000MPa, the yield strength is ≥850MPa, and the impact absorption energy (KU2) can reach over 70J, suitable for dynamic load and low-temperature working conditions.
- Excellent hardenability: The critical hardenability diameter can reach over 100mm. After quenching and tempering, the cross-sectional hardness is uniform, and the core performance is guaranteed.
- Good machinability: In the normalized or annealed state, the hardness is moderate, allowing for mechanical processing such as turning, drilling, and milling. After quenching and tempering, it has a good combination of strength and toughness.
- Strict flaw detection standards: Ultrasonic flaw detection can be carried out according to the national military standard or the flaw detection grade specified by the user (such as Grade A, Grade B) to ensure that there are no excessive internal defects.
- Diverse delivery states: Various states such as annealing, normalizing, and quenching and tempering can be provided to meet the needs of different subsequent processes; the surface can be treated as black skin, polished, or turned.
| Element | C | Si | Mn | Cr | Ni | Mo | V | P≤ | S≤ | |
| Content (%) | 0.32~0.40 | 0.17~0.37 | 0.40~0.70 | 1.00~1.30 | 1.00~1.30 | 0.20~0.30 | 0.10~0.20 | 0.025 | 0.025 | |
| Mechanical properties | Tensile strength Rm≥1000MPa; Yield strength Rp0.2≥830MPa; Elongation after fracture A≥12%; Reduction of area Z≥45%; Impact absorption energy KU2≥63J (longitudinal) | |||||||||
Technical advantages and production capacity: The company is equipped with advanced medium - frequency induction furnaces, electroslag remelting furnaces, and forging equipment. It can produce bars with a diameter of φ20~500mm, pipes with an outer diameter of φ50~400mm and a wall thickness of 5~80mm, and can undertake special - shaped forgings according to the drawings. Each batch of products undergoes re - inspection of chemical composition, mechanical property testing, and non - destructive flaw detection to ensure that the ex - factory quality meets the national military standard or the user agreement. We adhere to the business principle of "integrity - based" and have a good reputation in the industry. We have served many customers in the military, shipbuilding, mining machinery and other fields.
Endorsement of Trust and Consultation Advice: Liaocheng Jincheng Yangming Special Steel Co., Ltd. is located in Liaocheng City, Shandong Province. As a special steel enterprise mainly engaged in wholesale business for a long time, we have stable supply channels and a strict quality control system for precipitation-hardening steel, duplex steel, heat-resistant steel, corrosion-resistant alloys and other categories. The company adheres to the tenets of seeking truth from facts and being honest, and has received high praise in the industry. We are well aware of the importance of materials for military and high-end equipment, so we implement full-process traceability management from melting to finished products for key materials such as 35CrNiMoV. If you have requirements for materials of precision components such as artillery barrels, high-strength shafts and molds, please provide specific technical conditions (such as dimensional tolerance, quenching and tempering hardness range, flaw detection grade, delivery state, etc.). Our technical team will match the most suitable smelting, forging and heat treatment solutions according to your working conditions. Please contact our sales department directly and we will provide you with professional quotations and customized services.
35CrNiMoV has good hardenability and high matrix strength. It can be subjected to surface strengthening treatments such as gas nitriding and ion nitriding to improve wear resistance and fatigue strength. Note that the hardness level after quenching and tempering needs to match the nitriding process. It is recommended to provide the requirements for the pre-treatment state.
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