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20MnMoNi4-5 1.6311 Special Steel for Boiler and Pressure Vessel

20MnMoNi4-5 1.6311 Special Steel for Boiler and Pressure Vessel 1.6311 special steel 20MnMoNi4-5 1.6311 Special Steel for Boiler and Pressure Vessel 20MnMoNi4 5 1

20MnMoNi4-5 1.6311 Special Steel for Boiler and Pressure Vessel

Applications

• Boiler installations in accordance with Technical Rules TRD 101, EN 12952 etc. for temperatures up to 375 °C.
• Pressure vessel installations in accordance with the AD 2000-Merkblätter series W and HP for temperatures of – 10 °C to 375 °C.

All Grades Comparison

DIN EN
1.6311 20MnMoNi4-5

Quality Standard

EN 10250 Open steel die forgings for general engineering purposes. Alloy special steels

Chemical Composition(%)

C Mn Si P S Cr Ni Mo
0.17-0.23 1.00-1.50 0.40 max 0.035 max 0.035 max 0.50 max 0.40-0.80 0.45-0.60

Mechanical Properties(T=20°C if not differently stated)

Process Diameter(mm) Tensile Strength Rm (Mpa) Yield Strength Rp0.2 (Mpa) Elongation A5 (%) Impact Value Kv (J) Room Temperature
QUENCHED AND TEMPERED 40 max 590-750 470 min 18 min 35 min
QUENCHED AND TEMPERED 40-60 590-730 460 min 18 min 35 min
QUENCHED AND TEMPERED 60-100 570-710 450 min 18 min 35 min
QUENCHED AND TEMPERED 100-160 570-710 440 min 18 min 35 min
QUENCHED AND TEMPERED 160-330 550 min 390 min 17 min 39 min

HEAT TREATMENT:

  • Stress Relieving: Heat to 580 – 620°C. Generally the maximum stress relieving time shall be restricted to 150 min. If it exceeds 90 min or in case of repeated heat treatment the lower range of recommended temperatures shall apply.
  • Austenitizing + Quenchingg: Heat to 870 to 940 °C. After temperature achievement over the whole section cooling in water
  • Tempering: Heat to 610 to 690 °C. Holding 30 min time after temperature achievement over the whole section, cooling in still air

Forming properties and weldability:

1.6311 Special Steel can be hot or cold formed and can be welded and flame cut according to the general procedures. The guidelines
according to EN 1011 and VdTÜV-material data sheet 440/1 shall be observed. For the fabrication of pressure vessels in accordance with AD 2000 Merkblatt in the context of PED qualified welding consumables have to be applied.

Mill′s test certificate:

EN 10204/3.1 with all relevant data reg. chem. composition, mech. properties and results of testing.