General Characteristics
EN 1.4547 is a 6% molybdenum and nitrogen-alloyed austenitic stainless steel with extremely high resistance to both uniform and localized corrosion. This product was developed especially for oil and gas offshore platforms and the pulp and paper industry.
Typical Applications
Applications requiring resistance to chlorinated seawater
Flue gas cleaning
Maritime exhaust gas cleaning (EGC)
Bleaching equipment in the pulp and paper industry
Flanges and valves
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 | Other | |
Typical | 0.01 | 20.0 | 18.0 | 6.1 | 0.20 | Cu:0.7 | |
ASME II A SA-240 | ≤0.020 | ≤1.00 | 19.50-20.50 | 17.50-18.50 | 6.00-6.50 | 0.18-0.25 | Cu:0.50-1.00 |
ASTM A240 | ≤0.020 | ≤1.00 | 19.5-20.5 | 17.5-18.5 | 6.0-6.5 | 0.18-0.25 | Cu:0.50-1.00 |
EN 10028-7 | ≤0.020 | ≤1.00 | 19.5-20.5 | 17.5-18.5 | 6.0-7.0 | 0.18-0.25 | Cu:0.50-1.00 |
EN 10088-2 | ≤0.020 | ≤1.0 | 19.5-20.5 | 17.5-18.5 | 6.0-7.0 | 0.18-0.25 | Cu:0.5-1.0 |
EN 10088-3 | ≤0.020 | ≤1.00 | 19.5-20.5 | 17.5-18.5 | 6.0-7.0 | 0.18-0.25 | Cu:0.50-1.00 |
EN 10088-4 | ≤0.020 | ≤1.0 | 19.5-20.5 | 17.5-18.5 | 6.0-7.0 | 0.18-0.25 | Cu:0.5-1.0 |
IS 6911 | ≤0.020 | ≤1.00 | 19.5-20.5 | 17.5-18.5 | 6.0-6.5 | 0.18-0.25 | Cu:0.50-1.00 |
Mechanical Properties
The addition of nitrogen to EN 1.4547 gives higher proof strength and tensile strength. Despite the greater strength, the possibilities for cold as well as hot forming are very good.
Mechanical properties at room temperature are shown in the table below.
| Standard | Rp0.2 | Rp1.0 | Rm | Elongation | Rockwell | HB |
MPa | MPa | MPa | % | |||
Product type: Cold rolled coil and sheet | ||||||
Typical (thickness 1 mm) | 375 | 415 | 735 | 60 | ||
ASME II A SA-240 | ≥ 310 | ≥ 655 | ≤ 223 | |||
ASTM A240 | ≥ 310 | ≥ 655 | ≤ 96HRB | ≤ 223 | ||
EN 10028-7 | ≥ 320 | ≥ 350 | 650-850 | ≥ 35 | ||
EN 10088-2 | ≥ 320 | ≥ 350 | 650-850 | ≥ 35 | ||
EN 10088-4 | ≥ 320 | ≥ 350 | 650-850 | ≥ 35 | ||
IS 6911 | ≥ 310 | ≥ 690 | ≤ 96HRB | ≤ 223 | ||
Product type: Hot rolled coil and sheet | ||||||
Typical (thickness 4 mm) | ||||||
ASME II A SA-240 | ≥ 310 | ≥ 655 | ≤ 223 | |||
ASTM A240 | ≥ 310 | ≥ 655 | ≤ 223 | |||
EN 10028-7 | ≥ 320 | ≥ 350 | 650-850 | ≥ 35 | ||
EN 10088-2 | ≥ 320 | ≥ 350 | 650-850 | ≥ 35 | ||
EN 10088-4 | ≥ 320 | ≥ 350 | 650-850 | ≥ 35 | ||
IS 6911 | ≥ 310 | ≥ 690 | ≤ 96HRB | ≤ 223 | ||
Product type: Hot rolled quarto plate | ||||||
Typical (thickness 15 mm) | 320 | 350 | 680 | 50 | 160 | |
ASME II A SA-240 | ≥ 310 | ≥ 655 | ≤ 96HRB | ≤ 223 | ||
ASTM A240 | ≥ 310 | ≥ 655 | ≤ 96HRB | ≤ 223 | ||
EN 10028-7 | ≥ 300 | ≥ 340 | 650-850 | ≥ 40 | ||
EN 10088-2 | ≥ 300 | ≥ 340 | 650-850 | ≥ 40 | ||
EN 10088-4 | ≥ 300 | ≥ 340 | 650-850 | ≥ 40 | ||
IS 6911 | ≥ 310 | ≥ 655 | ≤ 96HRB | ≤ 223 | ||
Product type: Wire rod | ||||||
Typical | 340 | 380 | 680 | 50 | ||
Physical Properties
The typical values of some physical properties are given in the table below.
| Density | Modulus of elasticity | Thermal exp. at 100 °C | Thermal conductivity | Thermal capacity | Electrical resistance | Magnetizable |
kg/dm3 | GPa | 10-6/°C | W/m°C | J/kg°C | µΩm | |
8.0 | 195 | 16,5 | 14 | 500 | 0.85 | No |
