T1222 GB JIS G4801 ASTM A29M Spring Steel Flat Bar
T1222 GB JIS G4801 ASTM A29M Spring Steel Flat Bar
１．Product Overview
Spring steel flat bar is designed for applications requiring high elastic limit, fatigue resistance, and stable mechanical performance under repeated loading conditions.
Produced according to ASTM A29M, JIS G4801, GB/T1222, and GB/T3077 standards, these spring steel flat bars are commonly used in automotive suspension systems, industrial springs, mechanical components, agricultural machinery, and heavy-duty structural applications.
The controlled alloy composition supports strength stability, heat treatment performance, and wear resistance for demanding industrial environments.
２．Technical Solution
The spring steel flat bar is manufactured through hot rolling with controlled chemical composition and alloy design to improve hardness, resilience, and fatigue resistance.
Silicon, manganese, chromium, vanadium, and boron alloying elements improve tensile performance and heat treatment response, making the material suitable for dynamic load applications.
Thickness from 3mm to 20mm and width from 25mm to 180mm support multiple fabrication and spring processing requirements.
３．Specifications
| Parameter | Value |
|---|---|
| Product Type | Spring Steel Flat Bar |
| Standard | ASTM A29M / JIS G4801 / GB/T1222 / GB/T3077 |
| Thickness | 3–20mm |
| Width | 25–180mm |
| Length | 5800–6000mm / Custom |
| MOQ | 50MT per size |
| Surface | Hot Rolled |
| Application | Spring / Mechanical / Automotive / Industrial |
Material Grades
| China GB | USA AISI | JIS | Carbon C | Silicon Si | Manganese Mn | Chromium Cr |
|---|---|---|---|---|---|---|
| 55SiMnVB | 51B60 | SUP11 | 0.52–0.60 | 0.70–1.00 | 1.00–1.30 | ≤0.35 |
| 60SiMn | 9260 | SUP7 | 0.56–0.64 | 1.50–2.00 | 0.60–0.90 | ≤0.35 |
| 50CrVA | 6150 | SUP10 | 0.46–0.54 | 0.17–0.37 | 0.50–0.80 | 0.80–1.10 |
| 55CrMnA | 5155 | SUP9 | 0.52–0.60 | 0.17–0.37 | 0.65–0.95 | 0.65–0.95 |
| 60CrMnA | 5160 | SUP9A | 0.56–0.64 | 0.17–0.37 | 0.70–1.00 | 0.70–1.00 |
| 60CrMnBA | 51B60 | SUP11 | 0.56–0.64 | 0.17–0.37 | 0.70–1.00 | 0.70–1.00 |
４．Application
Spring steel flat bars are widely used for leaf springs, suspension systems, agricultural machinery, heavy equipment, industrial springs, railway components, trailer parts, and mechanical manufacturing.
They are suitable for applications requiring repeated stress resistance, elastic recovery, and stable strength performance.
５．Processing
The material supports cutting, punching, bending, heat treatment, machining, and spring forming processes.
Heat treatment can improve hardness, fatigue resistance, and wear performance according to application requirements.
６．Advantages
- High fatigue resistance for repeated load conditions
- Stable alloy composition for heat treatment performance
- Good elastic recovery and tensile strength
- Suitable for automotive and heavy industrial applications
- Multiple international standards available
- Wide thickness and width range for fabrication flexibility
７．How to Choose
- Choose 60SiMn or SUP7 for heavy-duty spring applications requiring high elasticity.
- Choose 50CrVA or SUP10 when higher wear resistance and strength stability are required.
- Confirm thickness, width, heat treatment condition, and processing requirements before ordering.
８．FAQ
Q1．What standards are available
ASTM A29M, JIS G4801, GB/T1222, and GB/T3077 standards are available.
Q2．What is the available thickness range
Thickness ranges from 3mm to 20mm.
Q3．What is the available width range
Width ranges from 25mm to 180mm.
Q4．Can custom lengths be supplied
Yes. Custom lengths can be supplied according to project requirements.
Q5．What are the main applications
The product is mainly used for springs, automotive suspension systems, machinery, and industrial equipment.
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