General Characteristics
304LN/4311 is a low-carbon, higher nickel and nitrogen alloyed alternative to 304/4301 with improved strength and low-temperature toughness. Suitable for applications that require high tensile strength. is an austenitic stainless steel that belongs to the standard CrNi stainless steel family.
The austenitic CrNi standard grades are the most widely used group of stainless steels. Their well-balanced material properties make them suitable for the fabrication of many products. Due to its fully austenitic structure, 304LN/4311 is suitable for applications with low magnetic permeability requirements (µ < 1.005).
Typical Applications
Railroad cars
Pressure vessels
Chemical plant equipment(mild to medium corrosive environments)
Flanges and valves
Product forms, available sizes and finishes
Flat
| Product type | Finishes | Thickness | Width |
| Cold rolled coil | 2B, 2BB, 2C, 2D, 2E, 2G, 2H, 2J, 2R | 0,05-6,00 | 3-2050 |
Cold rolled sheet | 2B, 2BB, 2D, 2E, 2G, 2H, 2J, 2R | 0,80-6,00 | 600-2050 |
Hot rolled coil, pickled | 1D, 1G, 1U | 2,00-12,70 | 750-2050 |
Precision strip | 2H, 2R | 0,05-1,50 | 3-649 |
Quarto plate | 1D | 5,00-50,00 | 400-3200 |
Long
| Product type | Finishes | Thickness | Width |
| Cast billet | 127,00-180,00 | 127-180 | |
Cast slab | 165,00-205,00 | 1000-1500 | |
Cold drawn bar hex | 8,00-25,40 | 8-25 | |
Cold drawn bar round | 6,00-25,40 | 6-25 | |
Cold drawn bar square | 8,00-22,00 | 8-22 | |
Rebar coil | LP PI | 6,00-25,00 | 6-25 |
Wire rod (Rod coil) hex | 9,00-27,00 | 9-27 | |
Wire rod (Rod coil) round | 5,00-27,00 | 5-27 | |
Wire rod (Rod coil) square | 9,00-24,00 | 9-24 |
Chemical Composition
The chemical composition may vary slightly between different product standards. The required standard will befully met as specified on the order.
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 | 18.5 | 9.2 | 0.14 | ||
ASME II A SA-240 | ≤0.030 | ≤2.00 | 18.0-20.0 | 8.0-12.0 | 0.10-0.16 | |
ASTM A240 | ≤0.030 | ≤2.00 | 18.0-20.0 | 8.0-12.0 | 0.10-0.16 | |
ASTM A666 | ≤0.030 | ≤2.00 | 18.0-20.0 | 8.0-12.0 | 0.10-0.16 | |
EN 10028-7 | ≤0.030 | ≤2.00 | 17.0-19.5 | 8.5-11.5 | 0.12-0.22 | |
EN 10088-2 | ≤0.030 | ≤2.0 | 17.5-19.5 | 8.5-11.5 | 0.12-0.22 | |
EN 10088-3 | ≤0.030 | ≤2.00 | 17.5-19.5 | 8.5-11.5 | 0.12-0.22 | |
EN 10088-4 | ≤0.030 | ≤2.0 | 17.5-19.5 | 8.5-11.5 | 0.12-0.22 | |
IS 6911 | ≤0.030 | ≤2.00 | 18.0-20.0 | 8.0-12.0 | ≤0.70 | 0.10-0.16 |
Mechanical Properties
The mechanical properties of the available products in the 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 grade ,along with other austenitic corrosion-resistant 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) | ||||||
ASME II A SA-240 | ≥ 205 | ≥ 515 | ≤ 217 | |||
ASTM A240 | ≥ 205 | ≥ 515 | ≤ 95HRB | ≤ 217 | ||
EN 10028-7 | ≥ 290 | ≥ 320 | 550-750 | ≥ 40 | ||
EN 10088-2 | ≥ 290 | ≥ 320 | 550-750 | ≥ 40 | ||
EN 10088-4 | ≥ 290 | ≥ 320 | 550-750 | ≥ 40 | ||
IS 6911 | ≥ 205 | ≥ 515 | ≤ 95HRB | ≤ 217 | ||
Product type: Hot rolled coil and sheet | ||||||
Typical (thickness 4 mm) | 355 | 410 | 665 | 50 | ||
ASME II A SA-240 | ≥ 205 | ≥ 515 | ≤ 217 | |||
ASTM A240 | ≥ 205 | ≥ 515 | ≤ 217 | |||
EN 10028-7 | ≥ 290 | ≥ 320 | 550-750 | ≥ 40 | ||
EN 10088-2 | ≥ 290 | ≥ 320 | 550-750 | ≥ 40 | ||
EN 10088-4 | ≥ 290 | ≥ 320 | 550-750 | ≥ 40 | ||
IS 6911 | ≥ 205 | ≥ 515 | ≤ 95HRB | ≤ 217 | ||
Product type: Hot rolled quarto plate | ||||||
Typical (thickness 15 mm) | 310 | 350 | 640 | 55 | ||
ASME II A SA-240 | ≥ 205 | ≥ 515 | ≤ 95HRB | ≤ 217 | ||
ASTM A240 | ≥ 205 | ≥ 515 | ≤ 95HRB | ≤ 217 | ||
EN 10028-7 | ≥ 270 | ≥ 310 | 550-750 | ≥ 40 | ||
EN 10088-2 | ≥ 270 | ≥ 310 | 550-750 | ≥ 40 | ||
EN 10088-4 | ≥ 270 | ≥ 310 | 550-750 | ≥ 40 | ||
IS 6911 | ≥ 205 | ≥ 515 | ≤ 95HRB | ≤ 217 | ||
Product type: Wire rod | ||||||
Typical | 320 | 360 | 640 | 55 | ||
Physical Properties (Data according to EN 10088)
| 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 |
