SUS304-CSP Ultra-Precision Stainless Steel Spring Strip
Ultra-Precision SUS304-CSP Stainless Steel Spring Strip
EN 1.4301 / AISI 304 / X5CrNi18-10. Precision CSP coils for springs, stamping, kitchen equipment, battery components and industrial applications.
How Foshan Yongjin Delivers Speed and Reliability
As a professional manufacturer and stockholder of precision stainless steel coils, we provide export-ready solutions for global partners.
- ✔️ Monthly ready stock: 4,000-7,000 MT; CSP monthly production capacity: 15,000-20,000 MT
- ✔️ Stable production capacity across 2 bases in China
- ✔️ Fast documentation + quick container booking
- ✔️ Precision CSP coils ready for electronics, stamping, springs, battery components & industrial applications
Massive Ready Stock. Rapid Export Delivery.
Backed by robust inventory and streamlined logistics, we ensure your supply chain never stops.
4,000-7,000MT Monthly Ready Stock
15,000-20,000MT Monthly CSP Capacity
72 HoursFrom Contract to Container
📦 CURRENT READY STOCK
- SUS304-CSP: 0.1-1.5mm (1/2H, 3/4H, FH)
- SUS301-CSP: 0.1-1.5mm (1/2H, 3/4H, FH, EH)
- SUS430 HARD | SUS316L HARD
🔍 Need ultra-thin? Precision thickness 0.05-0.10mm available in production.
Technical Specifications
Complies with JIS G4313, EN 10151, ASTM A666, ISO 6931-2 and DIN EN ISO 9445-P. Tolerances per DIN EN ISO 9445-P, closer tolerances on request.
Thickness
0.05 to 1.5mm
Ready stock 0.1 to 1.5mm
Width
300 to 1220mm
Hardness
ANN to H
Full CSP hardness spectrum
Surface
Precision Finished Surface
Ra 0.25 to 0.40 μm, excellent coil-to-coil consistency
Finish
2D / 2DD
Cold rolled bright finish
Supply Form
Original Export Coils
Coil weight 2 to 3 MT
Chemical Composition (%)
| Element | C | Si | Mn | P | S | Cr | Ni |
|---|---|---|---|---|---|---|---|
| SUS304-CSP (EN 1.4301) | ≤0.08 | ≤0.75 | ≤2.00 | ≤0.045 | ≤0.030 | 18.00-20.00 | 8.00-11.00 |
Mechanical Properties by Hardness Grade
| Condition | Hardness (HV) | Yield Strength (MPa) | Tensile Strength (MPa) | Elongation (%) |
|---|---|---|---|---|
| ANN | ≤200 | ≥205 | ≥520 | ≥40 |
| 1/2H | ≥250 | ≥470 | ≥780 | ≥6 |
| 3/4H | ≥310 | ≥670 | ≥930 | ≥3 |
| H (Full Hard) | ≥370 | ≥880 | ≥1130 | – |
In-House Precision Manufacturing
Two Supply Models, One Reliable Partner
🌱 Green Certified Products (Made-to-Order)
- Certification: RCS 2.0 & SCS ready, certified green production on request
- Recycled Content: Minimum 90% post-consumer, verified
- Production Model: Made-to-order for full traceability
- Documentation: Complete chain-of-custody for ESG reporting
Ideal for: Long-term projects requiring ESG compliance and sustainability reporting
⚡ Ready Stock Products
- Availability: Immediate delivery, dispatched within 72 hours
- Stock Range: SUS304-CSP, SUS301-CSP, SUS430 HARD, SUS316L HARD
- Turnaround: 72 hours dispatch from contract to container
- Documentation: Fast export paperwork + quick container booking
Ideal for: Urgent projects requiring fast turnaround
Compliance & Certifications
Frequently Asked Questions
What is the lead time for SUS304-CSP orders?
Ready stock coils are dispatched within 72 hours. For standard export orders, we move from contract to loaded container in 72 hours, backed by fast documentation and quick container booking. Made-to-order green certified or custom specifications follow a customized production schedule.
How much stock do you hold every month?
We maintain 4,000 to 7,000 MT of ready stock monthly, supported by a CSP monthly production capacity of 15,000 to 20,000 MT across our two production bases in China. This guarantees stable supply even during peak season.
Are your regular stock specifications complete?
Yes. Regular stock covers SUS304-CSP 0.1-1.5mm in 1/2H, 3/4H, FH; SUS301-CSP 0.1-1.5mm in 1/2H, 3/4H, FH, EH; plus SUS430 HARD and SUS316L HARD. For ultra-thin needs, precision thickness 0.05-0.10mm is available in production.
Do you hold a valid export license for stainless steel?
Yes. We hold the required export license for stainless steel products in line with China’s export licensing regulations effective January 1, 2026. Our documentation team handles the full licensing process so your shipment clears customs smoothly.
Can you provide a formal Form E certificate?
Yes. We issue the formal Form E certificate of origin under the China-ASEAN Free Trade Area, together with the complete export document set: Bill of Lading, Commercial Invoice, Packing List and Mill Test Certificate.
What is the difference between SUS304 and SUS304-CSP?
SUS304 is the general JIS designation for this austenitic grade. The “CSP” suffix means Cold Rolled Stainless Steel for Springs, indicating the material is specifically cold-worked to achieve precise hardness levels (ANN to H) and stable forming properties for spring and stamping applications.
How do I choose between SUS301-CSP and SUS304-CSP?
SUS301-CSP work-hardens faster and achieves higher strength and elasticity after cold rolling, making it ideal for high-stress springs and precision shrapnel. SUS304-CSP offers better corrosion resistance and formability, suitable for kitchenware, architectural components, and general stamping. Choose 301 for higher strength, and 304 for better corrosion resistance.
Is your SUS304-CSP available with recycled content certification?
Yes, we are RCS 2.0 and SCS ready. Certified green production with minimum 90% post-consumer recycled content is available on a made-to-order basis, with full transaction certificates for your ESG reporting.
Looking for a reliable CSP stainless steel supplier with fast turnaround?
📩 DM us or email morgan@yongjinss.com for stock list and export quotation. 🌐 yongjinss.com