NSPM supplies high-performance alloy structural steels designed specifically for demanding engineering and mechanical applications. These steels provide high strength, excellent toughness, and superior fatigue resistance.
In modern engineering and industrial manufacturing, material performance directly determines the safety, durability, and efficiency of final products. With optimized alloying elements such as chromium (Cr), molybdenum (Mo), nickel (Ni), and manganese (Mn), combined with carefully controlled heat treatment processes, NSPM alloy structural steels deliver outstanding mechanical performance.
Our goal is not only to supply steel, but to provide complete material solutions. From grade selection to supply condition optimization, NSPM supports your business with expertise, flexibility, and dependable delivery.
Low alloy structural steel refers to steel that contains a small percentage of alloying elements such as chromium, nickel, molybdenum, and manganese. These elements are added to improve mechanical properties. Compared to carbon steel, low-alloy structural steel has higher strength, toughness, wear resistance, and hardenability, making it suitable for manufacturing various mechanical parts with large cross-sectional dimensions.
NSPM offers a wide range of alloy structural steel grades that comply with international standards such as ASTM, EN, DIN, and JIS.
Our portfolio includes chromium-molybdenum steels, nickel-chromium steels, and manganese alloy steels.
These grades are widely recognized in global markets and are suitable for various engineering and mechanical applications.
| Grade | C | Si | Mn | P | S | Cr | Mo | Ni | Others |
| 41cr4 | 0.38-0.45 | 0.15-0.35 | 0.50-0.80 | ≤0.035 | ≤0.035 | 0.90-1.20 | |||
| 4140 | 0.38-0.43 | 0.15-0.35 | 0.75-1.00 | ≤0.035 | ≤0.035 | 0.80-1.10 | 0.15-0.25 | ||
| 42crmo4 | 0.38-0.45 | ≤0.40 | 0.60-0.90 | ≤0.035 | ≤0.035 | 0.90-1.20 | 0.15-0.30 | ||
| SCM440 | 0.38-0.43 | 0.15-0.35 | 0.60-0.90 | ≤0.035 | ≤0.035 | 0.90-1.20 | 0.15-0.30 | ||
| 4130 | 0.28-0.33 | 0.15-0.35 | 0.40-0.60 | ≤0.035 | ≤0.035 | 0.80-1.10 | 0.15-0.25 | ||
| 4145 | 0.43-0.48 | 0.15-0.35 | 0.75-1.00 | ≤0.035 | ≤0.035 | 0.80-1.10 | 0.15-0.25 | ||
| 4330v | 0.28-0.33 | ≤0.15 | 0.65-1.00 | ≤0.035 | ≤0.035 | 0.75-1.00 | 0.35-0.50 | 1.65-2.00 | V 0.05-0.10 |
| 4340 | 0.38-0.43 | 0.15-0.35 | 0.60-0.80 | ≤0.035 | ≤0.035 | 0.70-0.90 | 0.20-0.30 | 1.65-2.00 | |
| 34crnimo6 | 0.30-0.38 | ≤0.40 | 0.50-0.80 | ≤0.035 | ≤0.035 | 1.30-1.70 | 0.15-0.30 | 1.30-1.70 | |
| 18crnimo7-6 | 0.15-0.21 | ≤0.40 | 0.50-0.90 | ≤0.035 | ≤0.035 | 1.50-1.80 | 0.25-0.35 | 1.40-1.70 | |
| 16mncr5 | 0.14-0.19 | ≤0.40 | 1.00-1.30 | ≤0.035 | ≤0.035 | 0.80-1.10 | — | — | |
| 20mncr5 | 0.17-0.22 | ≤0.40 | 1.10-1.40 | ≤0.035 | ≤0.035 | 1.00-1.30 | — | — | |
| 1.8509 | 0.38-0.49 | ≤0.40 | 0.40-0.70 | ≤0.035 | ≤0.035 | 1.50-1.80 | 0.20-0.35 | 0.80-1.20 | |
| 1.8550 | 0.30-0.37 | ≤0.40 | 0.40-0.70 | ≤0.035 | ≤0.035 | 1.50-1.80 | 0.15-0.25 | 0.85-1.15 | |
| 38crmoal | 0.35-0.42 | 0.20-0.45 | 0.30-0.60 | ≤0.035 | ≤0.035 | 1.35-1.65 | 0.15-0.25 | — | Al 0.70-1.10 |
| 8620 | 0.18-0.23 | 0.15-0.35 | 0.70-0.90 | ≤0.035 | ≤0.035 | 0.40-0.60 | 0.15-0.25 | 0.40-0.70 | |
| 9840 | 0.38-0.43 | 0.20-0.35 | 0.70-0.90 | ≤0.035 | ≤0.035 | 0.70-0.90 | 0.20-0.30 | ||
| 100cr6 | 0.93-1.05 | 0.15-0.35 | 0.25-0.45 | ≤0.035 | ≤0.035 | 1.35-1.60 | ≤0.06 |
NSPM alloy structural steels are widely used in industries where components must endure heavy loads, repeated stress, and harsh operating conditions.
Our materials are engineered to deliver long-term reliability in critical applications.
shafts, gears, pinions
Transmission components operate under continuous torque and friction. Materials used in shafts, gears, and pinions must resist wear while maintaining strength and toughness.
NSPM alloy structural steels provide excellent fatigue resistance and surface hardness after heat treatment. This ensures long service life and stable performance in gearboxes and power transmission systems.
crankshafts, connecting rods, axle shafts
Automotive components are exposed to cyclic loading and dynamic stress. Crankshafts, connecting rods, and axle shafts require materials that combine strength with fatigue resistance.
NSPM steels are designed to perform under these demanding conditions. With optimized alloy composition and controlled heat treatment, our materials maintain structural integrity even under continuous operation.
structural parts, pins, fasteners
Heavy machinery operates in challenging environments where components are subjected to high loads, shock, and wear. Structural parts, pins, and fasteners must be durable and reliable.
NSPM alloy structural steels offer high load-bearing capacity and resistance to deformation. These properties make them suitable for construction equipment, mining machinery, and industrial systems.
high-load mechanical components
In general engineering, many components require a balance of strength, machinability, and durability. NSPM alloy structural steels meet these needs across a wide range of applications.
From machine parts to high-load mechanical structures, our materials provide consistent performance. We also offer customization services to match specific project requirements, ensuring efficiency and precision in manufacturing.
NSPM maintains a comprehensive inventory of alloy structural steel products to support diverse industrial needs.
Our product range includes round bars, flats, plates, forged blocks, and customized shapes.
We provide flexible supply options and value-added services such as cutting, machining, and heat treatment.
available sizes and supply conditions
We supply round bars from small diameters for precision components to large diameters for heavy-duty applications. These are widely used for shafts, rollers, and rotating parts.
Flat bars and plates are commonly used for structural and mechanical applications. NSPM supplies these products in various thicknesses and widths, ensuring compatibility with different fabrication processes.
For applications requiring large cross-sections and superior internal quality, we offer forged blocks. These products provide enhanced mechanical properties and structural integrity.
NSPM also provides customized shapes based on customer drawings. This service supports complex engineering projects that require precise specifications and unique geometries.
The performance of alloy structural steel is closely linked to its heat treatment condition. NSPM offers materials in different states to meet varying application demands.
Annealed condition provides lower hardness and improved machinability. It is suitable for components that require extensive machining before final use.
Normalized condition offers a uniform microstructure and balanced mechanical properties. It is commonly used in general engineering applications.
Quenched and tempered condition delivers high strength, toughness, and wear resistance. This is ideal for critical load-bearing components operating under high stress.
Our steels typically fall within the following hardness range:
NSPM alloy steels offer strength, toughness, hardenability, fatigue resistance, and machinability for demanding engineering applications.
Our alloy structural steels provide excellent load-bearing capacity with a strong balance of strength and toughness. This ensures reliable performance in components exposed to heavy loads and impact conditions.
With optimized alloying of Cr, Mo, and Mn, our steels offer outstanding hardenability. This allows uniform hardness and mechanical properties across both small and large cross-sections.
Our materials are developed to resist fatigue under continuous cyclic loading. This makes them suitable for critical components such as shafts, gears, and other dynamically loaded parts.
Through controlled heat treatment processes, our steels maintain a stable microstructure under complex stress conditions. This improves dimensional stability and reduces the risk of deformation during service.
Our alloy structural steels are designed with good machinability in mind. This enables efficient processing and supports the production of high-precision components with consistent quality.
Chromium (Cr)
Significantly increases strength, hardness, and wear resistance, while also improving corrosion resistance. It is a key element in stainless steel.
Nickel (Ni)
Enhances toughness and impact resistance, especially at low temperatures, and also improves corrosion resistance. It is widely used in austenitic stainless steels.
Molybdenum (Mo)
Improves strength and hardness, and provides excellent resistance to high temperatures and corrosion. It is commonly found in high-strength and tool steels.
Vanadium (V)
Refines the grain structure, leading to increased strength, toughness, and wear resistance. It is often used in high-strength low-alloy (HSLA) steels and tool steels.
Manganese (Mn)
Increases hardenability, strength, and hardness, while also improving toughness. It is widely used in structural and wear-resistant steels.
NSPM Steel — your reliable partner for engineering steel solutions
Stable supply from leading special steel mills
Competitive pricing advantage
Flexible delivery and supply solutions
Large stock and flexible cutting services
Professional technical support
Complete tool steel grade portfolio
Get in Touch
Here you will get suitable answers.
