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Basic Info.
Product Description
Spring steel refers to the steel specially used for manufacturing springs and elastic elements due to its elasticity in the quenching and tempering state. The elasticity of steel depends on its elastic deformation capacity, that is, within the specified range, the elastic deformation capacity makes it bear a certain load, and no permanent deformation occurs after the load is removed. Spring steel shall have excellent comprehensive properties, such as mechanical properties (especially elastic limit, strength limit, yield ratio), anti elastic property (i.e. anti elastic degradation property, also known as anti relaxation property), fatigue property, hardenability, physical and chemical properties (heat resistance, low temperature resistance, oxidation resistance, corrosion resistance, etc.). In order to meet the above performance requirements, spring steel has excellent metallurgical quality (high purity and uniformity), good surface quality (strict control of surface defects and decarburization), and accurate shape and size.
| Grade | C | Si | Mn | Cr | Ni | Mo | P | S | Cu |
| 20Mn2 | 0.17-0.24 | 0.17-0.37 | 1.40-1.80 | ≤0.30 | ≤0.30 | ≤0.10 | ≤0.030 | ≤0.030 | ≤0.30 |
| SMn420 | 0.17-0.23 | 0.15-0.35 | 1.20-1.50 | ≤0.35 | ≤0.25 | ≤0.030 | ≤0.030 | ≤0.30 | |
| 1524 | 0.19-0.25 | 0.15-0.30 | 1.35-1.65 | - | - | ≤0.040 | ≤0.050 | ≤0.20 | |
| 22Mn6 | 0.18-0.25 | 0.10-0.40 | 1.30-1.65 | ≤0.40 | ≤0.40 | ≤0.10 | ≤0.025 | ≤0.035 | ≤0.30 |
| 18Mn5 1.0436 | 0.15-0.20 | ≤0.40 | 0.90-1.60 | ≤0.30 | ≤0.30 | ≤0.08 | ≤0.025 | ≤0.015 | ≤0.30 |
| 30Mn2 | 0.27-034 | 0.17-0.37 | 1.40-1.80 | ≤0.30 | ≤0.30 | ≤0.10 | ≤0.030 | ≤0.030 | ≤0.30 |
| SMn433 | 0.30-0.36 | 0.15-0.35 | 1.20-1.50 | ≤0.35 | ≤0.25 | - | ≤0.030 | ≤0.030 | ≤0.30 |
| 1330 | 0.28-0.33 | 0.15-0.35 | 1.60-1.90 | ≤0.20 | ≤0.25 | ≤0.60 | ≤0.035 | ≤0.040 | ≤0.35 |
| 28Mn6 | 0.25-0.32 | 0.10-0.40 | 1.30-1.65 | ≤0.40 | ≤0.40 | ≤0.10 | ≤0.025 | ≤0.035 | ≤0.30 |
| 1.1170 | 0.25-0.32 | ≤0.40 | 1.30-1.65 | ≤0.40 | ≤0.40 | ≤0.10 | ≤0.030 | ≤0.035 | ≤0.30 |
| Material Science: | Hot rolled/cold drawn/forged steel round steel |
| Process: | It is forged from vacuum degassed steel ingot. |
| Diameter: | 25mm - 1000mm (optional) |
| Length: | 1000mm-12000mm Straightness:3mm/M max(optional) |
| Process: | EAF+LF+VD+forging+heat treatment (optional) |
| Delivery conditions: | Hot forging+rough machining (black surface after Q/T)+double tempering. |
| Delivery time | 15-25 days |
| Minimum order quantity: | 5 tons |
| Heat treatment: | Normalizing/annealing/quenching/tempering (optional) |
| Technical data: | Chemical composition, physical properties and mechanical tests according to customer requirements |
| characteristic: | According to your requirements |
| Test: | Ultrasonic test according to SEP 1921-84 C/c and D/d (optional) |
| Tag: | Grade, heat resistant NO The length will be printed with the required color on each bar |
| Payment: | T T 30% in advance; The balance shall be paid against shipping documents or irrevocable letter of credit at sight before shipment |
| Terms of trade | FOB,C&F,EXW... |
(1) 50 ton and above UHP electric furnace smelting → 60 ton and above LF furnace refining → 60 ton and above VD furnace vacuum treatment → alloy steel billet or rectangular billet continuous casting (260mm × 300mm,180mm × 220mm) → slow cooling or hot delivery → rolling → finishing → inspection and warehousing.(2) 90t and above converter smelting → 100t and above LF refining → 100t and above RH furnace vacuum treatment → alloy steel billet or rectangular billet continuous casting → (e.g. 320mm × 340mm,240mm × 240mm) slow cooling or hot delivery → rolling → finishing → inspection and warehousing
| 20Mn2 | The properties of 20Mn2 and 20Cr with medium strength and small section size are similar, and the low-temperature impact toughness and welding properties are better than those of 20Ct. During cold deformation, the plasticity is high, the machinability is good, the hardenability is higher than the corresponding carbon steel, and the heat treatment has the tendency of overheating, decarburization sensitivity and temper brittleness |
| 30Mn2 | 30Mn2 is usually used after quenching and tempering treatment. It has high strength, good toughness, and excellent wear resistance. When making parts with small section size, it has good static strength and fatigue strength, good wire drawing, cold heading, and heat treatment processability, medium machinability, and weldability. Generally, it does not need to be welded. When welding is needed, the parts should be preheated to more than 200 ° C, with high hardenability, and small quenching deformation, But it is sensitive to overheating, decarburization and temper brittleness |
| 35Mn2 | The carbon content is higher than that of 30Mn2, so it has higher strength and better wear resistance. The hardenability is also improved, but the plasticity is slightly reduced. The plasticity during cold deformation is medium, the machinability is medium, the weldability is low, and there are white spot sensitivity, overheating tendency and temper brittleness tendency. Water cooling is easy to produce cracks, and it is generally used in the quenched and tempered or normalized state |
| 40Mn2 | Medium carbon quenched and tempered manganese steel is superior to 40 steel in strength, plasticity and wear resistance, and has good heat treatment processability and machinability. It has poor weldability. When the carbon content is below *, it needs to be preheated to 100-425 ºC before welding. It has temper brittleness, overheating sensitivity, and water cooling is easy to produce cracks. It is usually used in the quenched and tempered state |
| 45Mn2 | Medium carbon quenched and tempered steel, with high strength, wear resistance and hardenability, can obtain good comprehensive mechanical properties after quenching and tempering, and is suitable for oil cooling and high temperature tempering. It is often used in the quenched and tempered state, and can also be used in the normalized state when necessary. The machinability is fair, but the weldability is poor, the plasticity is low when cold deformation occurs, the heat treatment has the tendency of over heat sensitivity and temper brittleness, and cracks are easily produced when water cooling |
| 50Mn2 | Medium carbon quenched and tempered high-strength manganese steel has high strength, high elasticity, excellent wear resistance, high hardenability, good machinability, low cold deformation plasticity, poor welding performance, overheating sensitivity, white spot sensitivity and temper brittleness, and cracks are easy to occur in water cooling. Proper quenching and tempering treatment can obtain good comprehensive mechanical properties, which can be used after quenching and tempering, normalizing and tempering |
Spring is used under impact, vibration or long-term alternating stress, so spring steel is required to have high tensile strength, elastic limit and high fatigue strength. In terms of technology, it is required that the spring steel has certain hardenability, is not easy to decarburize, and has good surface quality. That is, it is a high-quality carbon structural steel with a carbon content of 0.6% - 0.9%. Alloy spring steel is mainly silicon manganese steel, and their carbon content is slightly lower, mainly by increasing silicon content Wsi to improve properties; In addition, there are chromium, tungsten and vanadium alloy spring steels. In recent years, combined with Chinese resources and according to the requirements of new technologies for automobile and tractor design, a new steel grade with boron, niobium, molybdenum and other elements added to the silicon manganese steel has been developed, which extends the service life of the spring and improves the quality of the spring. . 
1. Who are we?
Our headquarter is located in Shandong, China. Since 2022, we have sold to North America (60.00%), Western Europe (14.00%) and South America (6.00%). There are about 11-50 people in our office.
2. How do we guarantee quality?
Always provide pre-production samples before mass production;
Always carry out final inspection before shipment;
3. What can you buy from us?
Copper, aluminum, die steel, titanium, customized machine parts
4. Why should you buy from us instead of other suppliers?
The company has 25 years of production experience. It has advanced precision production equipment, modern large warehouse, 200000 tons of inventory goods and a number of long-term stable cooperative customers.
5. What services can we provide?
Accepted delivery conditions: FOB, CFR, CIF, EXW
Accepted payment currency: US dollar, Euro, Japanese yen, Canadian dollar, Australian dollar, Hong Kong dollar, British pound, RMB, Swiss franc;
Accepted payment type: T/T, L/C, D/P D/A, PayPal;
Optional ports: Tianjin, Shanghai, Guangzhou;
Spoken: English, Chinese
6. How can we get your price?
A. We need the following information to quote for you:
1). Product Name
2). standard
3). Material grade (chemical composition)
4). dimension
5). amount
6). Special part drawing