Summary
Compared with 304, it contains low Cr, low Ni content, and high N content, which can achieve higher strength through cold working.
Features
1) High strength and hardness are obtained after cold working deformation;
2) Compared with ordinary steel grades, it has excellent high-temperature strength, fatigue resistance and corrosion resistance. It is used in trams to achieve light weight and reduce costs.
Scope of application
Electronic product components, medical equipment, springs, internal and external decoration and structure of trams.
Chemical composition (JIS G4305-2005) (wt%)
Chemical composition | C | Si | Mn | P | S | Cr | Ni | N |
Standard | ≤0.03 | ≤1.0 | ≤2.0 | ≤0.045 | ≤0.030 | 16.0~18.0 | 6.0~8.0 | ≤0.2 |
General | 0.02 | 0.5 | 1.5 | 0.025 | 0.002 | 17.30 | 7.10 | 0.14 |
Performance (JIS G 4305-2005)
Grade | Surface condition | Mechanical performance requirements | Note | ||
Ys(Mpa) | Ts(Mpa) | El(%) | |||
| Standard | 1/4 H | 343 | 686 | 40 | – |
2/4 H | 412 | 765 | 35 | – | |
3/4 H | 480 | 823 | 25 | – | |
H | 686 | 931 | 20 | – | |
| General | 1/4H | 445 | 700 | 57 | 1.2t |
Physical properties
Density (g/cm3) | Magnetic | Specific heat 250C(J/kg.0C) | Thermal conductivity 1000C(W/m. 0C) | Thermal expansion rate 20~1000C(10-6/0C) |
| 7.93 | None | 500 | 16.3 | 16.9 |
Heat treatment
Melting point: 1400~14200C;
Solution treatment: 1010~11500C, rapid cold.
Use status
1) Annealing and solid solution state:
NO. 1, 2D, 2B, and various other surface treatment states;
2) Rolled hard state:
1/4H, 2/4H, 3/4H, H, this is the most important use state of 301L.
Precautions for use
Magnetism will appear after cold processing;
301L steel grades are divided into many modified steel grades due to different internal compositions; different modified 301L steel grades are selected according to the different hardness requirements of customers.