Spring steel flat bar is a name given to a wide range of steels used in the manufacture of different products, including swords, saw blades, springs and many more. These steels are generally low-alloy manganese, medium-carbon steel or high-carbon steel with a very high yield strength.
The axle is widely applied to mainly used in automobile leaf spring, steering arm of air suspension, spring clamps, antennas, springs, and vehicle coil springs, leaf springs, and s-tines.
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| Services quality management system | Implementing ISO9001-2015 |
| Product technical standard | Implementing GB/T 33164.1-2016, JIS, DIN, ASTM |
| Thickness tolerance | ±0.50 mm |
| Thickness tolerance | ±0.80 mm |
| Side bending | ≤0.25% |
| Plane bending | ≤0.50% |
| Hardness/HBW | ≤360 |
| Surface quality: | All thickness Max defect depth: 0.15mm |
| Sales volume (tons) | 1,800,000+ |
| Warranty | 18 months since shipping date |
Comprehensive Info of Spring Steel Flat Bar:
| Land area (square meters) | 2,800,000+ |
| Sales volume (tons) | 1,800,000+ |
| Number of employees | 8000+ |
| Technical professionals | 1200+ |
| Market shares | 50%+ in China |
| Overseas market | It takes more than 30% of total quantity of the spring steel flat bar imports in the countries of Southeast Asia, Sout America, North Africa and so on. |
| Available certificates | COC; PVOC; CIQ; SONCAP; BV; C/O; FORM E. |
| Executive standards | GB, JIS, DIN, ASTM and technical agreement. (GB/T 33164.1-2016; JIS G 4801：2011; EN 10089：2002; EN 10092-1-2003; ASTM A322;ASTM A304-04; SAE J1268；SAE J404). |
| Grades of spring steel flat bar | 60Si2Mn; 50CrV; 55CrMn; 55SiMnVB;60CrMn;28SiMnB;51CrMnV; 52CrMnMoV; 60Si2CrV; 60CrMnB; 55SiMnVB; 50CrVA 55CrMnA; 60CrMnA; 28MnSiB; 60CrMnBA; SUP7; SUP9; SUP9A; SUP10; SUP11A; 55Cr3; 51CrV4; 61SiCr7; 52CrMoV4; 5160; 5160H; 6150; 6150H; 51B60; 51B60H; SAE5160; SAE5160H; SAE6150; SAE6150H; SAE51B60; SAE51B60H; 52CrMnBA; 50CrMnVA; FAS3550; NHS3. |
| Width x thickness | 44.5x6; 44.5x8; 45x6; 45x8; 50x6; 50x7; 50x8; 50x9; 50x13; 60x6; 60x7; 60x8; 60x9; 60x10; 60x12; 60x14; 70x6; 70x7; 70x8; 70x9; 70x10; 70x11; 70x12; 70x13; 70x14; 70x6; 75x10; 75x1 1; 75x12; 75x13; 75x14; 75x15; 75x16; 75x18; 75x10; 75x11; 80x10; 80x11; 80x12; 80x13; 80x14; 90x10; 90x11; 90x12; 90x13; 90x14; 90x15; 90x16; 90x18; 90x20; 90x22; 90x25; 100x12; 100x14; 100x16; 100x18; 100x20; 100x22; 100x25; 120x12; 120x 14; 120x16; 120x18; 120x20 ... |
| Width range | from 44.5 mm to 140 mm |
| Thickness range | from 6 mm to 59 mm |
| Length range | from 3000mm to 7000mm |
| Components | Cutting flat bar, Semi-leaf spring etc. |
| Package | Bundle |
| Standards implemented | ISO9001-2015, GB/T 33164.1-2016, JIS, DIN, ASTM |
| Payment | TT, LC, DP |
| Lead time | About 30 days |
| MOQ | 10 tons |
| Available sizes of spring steel flat bars (With x Thickness)(mm) | ||||||
| 44.5x6 | 60x6 | 70x6 | 75x10 | 80x10 | 90x10 | 100x12 |
| 44.5x8 | 60x7 | 70x7 | 75x11 | 80x11 | 90x11 | 100x14 |
| 45x6 | 60x8 | 70x8 | 75x12 | 80x12 | 90x12 | 100x16 |
| 45x8 | 60x9 | 70x9 | 75x13 | 80x13 | 90x13 | 100x18 |
| 50x6 | 60x10 | 70x10 | 75x14 | 80x14 | 90x14 | 100x20 |
| 50x7 | 60x12 | 70x11 | 75x15 | ... | 90x15 | 100x22 |
| 50x8 | 60x14 | 70x12 | 75x16 | 90x16 | 100x25 | |
| 50x9 | ... | 70x13 | 75x18 | 90x18 | 120x12 | |
| 50x13 | 70x14 | ... | 90x20 | 120x14 | ||
| ... | ... | 90x22 | 120x16 | |||
| 90x25 | 120x18 | |||||
| ... | 120x20 | |||||
| ... | ||||||
| Remark:Other sizes are available according to customers' request | ||||||
| Spring flat bar grade correspondence table | ||||||
| S/N | GB | ISO | AISI | JIS | BS | NF |
| 1 | 60Si2Mn | 61SiCr7 | 9260 | SUP7 | 250A58 | 61SC7 |
| 2 | 55CrMnA | 55Cr3 | 5155 | SUP9 | 55Cr3 | |
| 3 | 60CrMnA | 65MnCr4 | 5160 | SUP9A | ||
| 4 | 50CrVA | 50CrV4 | 6150 | SUP10 | ||
| 5 | 60CrMnBA | 60CrB3 | 51B60 | SUP11A | ||
About production processes of leaf springs, please kindly visit YOUTUBE link:
Workshops and production of WONDEE Autoparts spring steel flat bar :