Overview
420 stainless steel, known as S42000, is a martensitic, hardenable alloy that stands out for its enhanced strength and hardness compared to other stainless steels like 410 and 416. It contains at least 12% chromium for corrosion resistance and higher carbon content, which increases its wear resistance and allows it to achieve a Rockwell hardness of up to 50 HRC after heat treatment. This steel exhibits good ductility in the annealed condition, but its machinability decreases once hardened beyond 30 HRC. Despite its good corrosion resistance, especially when hardened and polished, it is not as resistant as common austenitic grades and is limited by a loss of ductility at sub-zero temperatures and a loss of strength at elevated temperatures due to over-tempering. Common applications include bushings, dental and surgical instruments, pump parts, valve components, and shafts. It is not recommended for use above tempering temperatures due to a reduction in mechanical properties, and welding is possible with the right techniques .
General Properties
420 stainless steel is a high-carbon martensitic grade that offers a balance of hardness and corrosion resistance. It is known for its high hardness, wear resistance, and moderate corrosion resistance. The steel's composition includes carbon (C: 0.15-0.40%), chromium (Cr: 12.0-14.0%), and other elements in smaller amounts such as manganese (Mn), silicon (Si), phosphorus (P), and sulfur (S) .
Aplikasi
420 stainless steel is used in a variety of applications where strength and durability are essential, such as in cutlery, surgical instruments, and tools. It is also used in precision machinery, bearings, electrical equipment, instruments, transportation vehicles, household appliances, and food utensils.
Ketahanan Korosi:
While 420 stainless steel provides good corrosion resistance, especially when hardened and polished, it is not as resistant as common austenitic grades. Its corrosion resistance is compromised at sub-zero temperatures and at elevated temperatures due to over-tempering .
Tahan Panas:
The useful operating range of 420 stainless steel is limited by its loss of ductility at sub-zero temperatures and loss of strength at elevated temperatures due to over-tempering .
Kemampuan mesin:
420 stainless steel is relatively easy to machine in the annealed condition, but machining becomes more difficult once hardened to above 30 HRC .
Pengelasan:
Welding is not common for this alloy due to its hardening properties, but it is possible with the right techniques and post-weld heat treatment to prevent cracking .
Pengerjaan Panas:
Hot working of 420 stainless steel can improve its toughness and wear resistance .
Pengerjaan Dingin:
Cold working can increase the steel's hardness and strength while also improving its surface quality and dimensional accuracy .
Anil:
Annealing is used to soften the steel, improve machinability, and prepare it for further heat treatment processes .
Tempering:
Tempering is used to reduce brittleness and internal stresses after hardening .
Pengerasan:
420 stainless steel can be hardened to achieve high hardness levels through a process of heating and rapid cooling (quenching) .
Milik | Nilai |
---|---|
Kepadatan | 7.74 g/cm³ |
Modulus Elastisitas | 200 GPa (29 x 10^6 psi) |
Coefficient of Thermal Expansion | 10.3 μm/m·°C (5.7 μin./in.·°F) |
Konduktivitas Termal | 24.9 W/m·K (14.4 Btu/ft·h·°F) |
Panas Spesifik | 460 J/kg·K (0.11 Btu/lb·°F) at 0-100°C (32 to 212°F) |
Resistivitas Listrik | 0.55 μΩ·m at 20°C |
Milik | Kekuatan Luluh, min. (ksi) | Kekuatan Tarik, min. (ksi) | Perpanjangan, min. (%) | Kekerasan, maks. (Rb) |
420 | 345 (50) | 655 (95) | 25 | 321 HBS |
Nilai | Carbon (C) | Manganese (Mn) | Silicon (Si) | Phosphorus (P) | Sulfur (S) | Chromium (Cr) | Nickel (Ni) | Molybdenum (Mo) | Iron (Fe) |
420 | 0.15 - 0.40% | ≤1.00% | ≤1.00% | ≤0.040% | ≤0.030% | 12.0 - 14.0% | ≤0.75% | ≤0.50% | Keseimbangan |
Baja tahan karat 420 berkinerja sangat baik di lingkungan lembap atau keras, tahan karat, dan memperpanjang umur produk.
SS420 memiliki kekuatan tinggi, membuatnya cocok untuk aplikasi yang memerlukan tekanan tinggi dan penggunaan sering, seperti peralatan dan perlengkapan medis.
Baja tahan karat 420 memiliki permukaan halus yang tidak mudah kotor, membuatnya mudah dibersihkan dan dirawat, sehingga sangat cocok untuk lingkungan pengolahan makanan dan medis.
Jenis | Lebar (mm) | Berat (MT) | Ketebalan (mm) | ||||
420 Coil | 1000, 1219, 1240, 1500 atau Disesuaikan | 3-10 | 0.15-3.0 |
Jenis | Lebar (mm) | Panjang (mm) | Ketebalan (mm) | |||||||||
420 Sheets | 1000, 1219, 1240, 1500 atau Disesuaikan | 2000, 2438, 2500, 3000, 3048 | 0.3-3.0 |
Pilihan penyelesaian dasar untuk gulungan dan lembaran baja tahan karat 201, 304, 304L, 316, 316L, dan 430, dll. meliputi Finis 2B, BA, No. 1, dan No. 4. Silakan hubungi tim penjualan profesional kami untuk informasi lebih lanjut tentang mutu dan hasil akhir lainnya.
Kami berkomitmen untuk memberikan layanan terbaik dan berkualitas tinggi kepada pelanggan kami untuk memastikan kepuasan pelanggan kami.
Disertifikasi oleh lembaga bergengsi dan berkomitmen untuk mematuhi standar internasional dalam setiap aspek.
Baja Tahan Karat merupakan material yang sangat diperlukan dalam berbagai industri, mulai dari pengolahan makanan dan peralatan medis hingga barang-barang rumah tangga, konstruksi, dan aplikasi industri.
Umpan balik pelanggan merupakan cerminan paling autentik mengenai kualitas suatu perusahaan.
Lihat lebih banyak referensi teknis dari Sanmei Metal mengenai gulungan baja tahan karat dan lembaran baja tahan karat.