General Characteristics
301LN/4318 is a low-carbon, nitrogen alloyed alternative to 301/4310 with elevated strength, making it particularly suitable for lightweight construction. Temper rolled 301LN/4318 is used for applications that require increased hardness and strength.
301LN/4318 is an austenitic CrNi stainless steel with high nitrogen and relatively low nickel content. Due to its high nitrogen content, 301LN/4318 has increased mechanical strength and shows a high degree of work hardening on mechanical deformation. As nitrogen-alloying improves corrosion properties, this product offers similar corrosion resistance to austenitic CrNi standard grades in many corrosive environments.
301LN/4318 is used in applications where corrosion resistance and a combination of high mechanical strength and good formability are needed. Due to its tendency to work hardening, 301LN/4318 can absorb an increased amount of energy during deformation. It can be delivered in the temper rolled condition with different strength levels.
Typical Applications
Automotive applications, especially vehicle chassis
Railroad cars
Product forms, available sizes and finishes
Flat
| Product type | Finishes | Thickness | Width |
Black hot band | 1U | 3,00-8,00 | 1000-1550 |
Cold rolled coil | 2B, 2BB, 2C, 2D, 2E, 2G, 2H, 2J, 2K, 2M, 2R | 0,05-6,35 | 3-1530 |
Cold rolled sheet | 2B, 2BB, 2D, 2E, 2G, 2H, 2J, 2M, 2R | 0,40-6,35 | 35-1530 |
Hot rolled coil, pickled | 1C, 1D, 1G, 1M, 1U | 2,00-10,00 | 50-1550 |
Precision strip | 2H, 2R | 0,05-1,50 | 3-649 |
Chemical Composition
The typical chemical composition for this grade is given in the table below, together with composition limits given for the product according to different standards. The required standard will be fully met as specified on the order.
The chemical composition is given as % by mass.
| C | Mn | Cr | Ni | Mo | N | |
| Typical | 0.02 | 17.7 | 6.5 | 0.14 | ||
ASTM A240 | ≤0.03 | ≤2.00 | 16.0-18.0 | 6.0-8.0 | 0.07-0.20 | |
ASTM A666 | ≤0.03 | ≤2.00 | 16.0-18.0 | 6.0-8.0 | 0.07-0.20 | |
EN 10028-7 | ≤0.030 | ≤2.00 | 16.50-18.50 | 6.00-8.00 | 0.10-0.20 | |
EN 10088-2 | ≤0.030 | ≤2.0 | 16.5-18.5 | 6.0-8.0 | 0.10-0.20 | |
EN 10088-4 | ≤0.030 | ≤2.0 | 16.5-18.5 | 6.0-8.0 | 0.10-0.20 | |
IS 6911 | ≤0.03 | ≤2.00 | 16.0-18.0 | 6.0-8.0 | ≤0.70 | 0.07-0.20 |
Mechanical Properties
The mechanical properties of the available products in soft annealed condition at room temperature are given in the table below. Moderate strengths can be reached at elevated temperatures (~550 °C / 1022 °F). Temperatures for excessive scaling are close to 850 °C/1562 °F.
This product, along with other austenitic corrosion resistant stainless steels, exhibits very high ductility and high elongation to fracture. It is not susceptible to brittle fracture in the solution annealed condition.
| Standard | Rp0.2 | Rp1.0 | Rm | Elongation | Rockwell | HB |
MPa | MPa | MPa | % | |||
Product type: Cold rolled coil and sheet | ||||||
Typical (thickness 1 mm) | 360 | 400 | 750 | 55 | ||
ASTM A240 | ≥ 240 | ≥ 550 | ≤ 100HRB | ≤ 241 | ||
EN 10028-7 | ≥ 350 | ≥ 380 | 650-850 | ≥ 40 | ||
EN 10088-2 | ≥ 350 | ≥ 380 | 650-850 | ≥ 40 | ||
EN 10088-4 | ≥ 350 | ≥ 380 | 650-850 | ≥ 40 | ||
IS 6911 | ≥ 240 | ≥ 550 | ≤ 100HRB | ≤ 241 | ||
Product type: Hot rolled coil and sheet | ||||||
Typical (thickness 4 mm) | 350 | 400 | 740 | 47 | 90 | |
ASTM A240 | ≥ 240 | ≥ 550 | ||||
EN 10028-7 | ≥ 350 | ≥ 380 | 650-850 | ≥ 40 | ||
EN 10088-2 | ≥ 350 | ≥ 380 | 650-850 | ≥ 40 | ||
EN 10088-4 | ≥ 350 | ≥ 380 | 650-850 | ≥ 40 | ||
IS 6911 | ≥ 240 | ≥ 550 | ≤ 100HRB | ≤ 241 | ||
Product type: Hot rolled quarto plate | ||||||
Typical (thickness 15 mm) | 345 | 380 | 750 | 45 | ||
ASTM A240 | ≥ 240 | ≥ 550 | ||||
EN 10028-7 | ≥ 330 | ≥ 370 | 650-850 | ≥ 40 | ||
EN 10088-2 | ≥ 330 | ≥ 370 | 630-830 | ≥ 40 | ||
EN 10088-4 | ≥ 330 | ≥ 370 | 630-830 | |||
IS 6911 | ≥ 240 | ≥ 550 | ≤ 100HRB | ≤ 241 | ||
Physical Properties
The physical properties of the available products are given in the table below Austenitic crystal structure, non-magnetic as soft annealed. Becomes easily magnetic when deformed.
| Density | Modulus of elasticity | Thermal exp. at 100 °C | Thermal conductivity |
kg/dm3 | GPa | 10-6/°C | W/m°C |
7.9 | 200 | 16.0 | 15 |
