1. Tổng quan
AISI 420 stainless steel, also known as 3Cr13 or SUS420J2, is a martensitic stainless steel containing about 13% chromium.
It offers an excellent combination of độ cứng, Đang đeo điện trở, và kháng ăn mòn after appropriate heat treatment, making it a preferred material for dụng cụ cắt, Lưỡi dao, and mechanical wear parts.
Jiaxiao MTC manufactures AISI 420 stainless steel strips in cold rolled annealed Và cứng & tôi luyện conditions, with polished or bright finishes to meet the highest precision standards.
2. Chemical Composition and Equivalent Grades
| Tiêu chuẩn | Equivalent Grades | C (%) | Mn (%) | Si (%) | Cr (%) | Ni (%) | P max | S max |
|---|---|---|---|---|---|---|---|---|
| DIN | 3Cr13 | 0.25–0.35 | ≤1.50 | ≤1.00 | 12.0–14.0 | — | ≤0.035 | ≤0.035 |
| AISI | 420 | — | — | — | — | — | — | — |
| Anh ta | SUS420J2 | — | — | — | — | — | — | — |
The relatively high chromium content provides good corrosion resistance, while the moderate carbon level ensures the ability to achieve high hardness (up to 50–52 HRC) after quenching and tempering.
3. Manufacturing and Processing
Jiaxiao MTC employs a full range of processing steps to ensure the highest quality surface finish and dimensional accuracy:
- Raw Material Selection:
Only ISO-certified hot rolled coils are used as the starting material. - Acid Pickling:
Removes oxides and surface impurities for uniform rolling. - Cuộn lạnh:
Reduces thickness with precise tolerance control. - Ủ:
Conducted in a controlled atmosphere to prevent decarburization and achieve a bright surface. - Hardening and Tempering:
- Hardening temperature: 980–1050°C
- Tempering temperature: 150–370°C
- Results in high hardness with retained corrosion resistance.
- Surface Finishing and Edge Treatment:
Available finishes include sáng, đánh bóng, or mirror, and edges can be slit, làm tròn, or square.
4. Mechanical Properties
| Condition | Độ cứng | Độ bền kéo | Hoàn thiện bề mặt | Edge Type |
|---|---|---|---|---|
| Ăn | ≤200 HV | 600–800 N/mm² | Bright / Mirror | Khe hở / Mill |
| Cứng & Nóng tính | 40–52 HRC | 1300–1600 N/mm² | Polished / Bright | Rounded / Square |
Phạm vi độ dày: 0.1–5.0 mm
Phạm vi chiều rộng: up to 500 mm
5. Đặc điểm chính
- Kháng ăn mòn:
Excellent in dry air, freshwater, mild acids, and alkalis. - Hardness and Wear Resistance:
High hardness achievable after quenching; ideal for cutting edges and mechanical wear parts. - Polishability:
Smooth, sáng, and mirror surface finish possible for decorative or precision applications. - Khả năng gia công:
Good machinability in annealed condition; easy to harden for final performance. - Dimensional Accuracy:
Maintained through precision cold rolling and levelling.
6. Typical Applications
AISI 420 stainless steel strip is widely used across various industries that require both sức mạnh cơ học Và surface durability:
- Công cụ cắt & Blades:
Knife blades, trowel blades, scrapers, Dao putty, and scissors. - Industrial Components:
Wear-resistant spacers, shims, vòng đệm, and clips. - Automotive Applications:
Seatbelt parts, clutch discs, and decorative trims. - Shoe Hardware & Accessories:
Toe caps, shoe shanks, and insole supports.
7. Quality Control and Standards
Jiaxiao MTC follows strict quality assurance procedures throughout production:
- Chemical Composition Testing — confirmed via spectrometer.
- Hardness Testing — Vickers, Rockwell, and Brinell methods.
- Flatness and Straightness — controlled within tolerance classes R1–R4.
- Surface Inspection — mirror and polished surfaces free from oxidation or pitting.
Thickness tolerance: ±0.015–0.070 mm
Width tolerance: ±0.20–0.80 mm
8. Packaging and Delivery
Each coil is:
- Lightly oiled to prevent corrosion,
- Wrapped in plastic film and anti-rust paper,
- Packed in wooden pallets or steel frames for export,
ensuring safe arrival in perfect condition.
9. About Jiaxiao MTC
Công ty TNHH Công nghệ Vật liệu Quảng Châu Jiaxiao, Ltd.
specializes in high carbon steel, Thép hợp kim, và dải thép không gỉ for global industrial use.
With advanced rolling, ủ, and polishing facilities covering 25,000 m² and over 100 skilled staff, Jiaxiao MTC provides đáng tin cậy, high-quality steel materials for manufacturers in the tooling, automotive, and hardware sectors.
Annual production capacity exceeds 15,000 tấn.
