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20MnMoNi4-5
EN 10250-3:1999, Number: 1.6311
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Comparison of steel grades
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JUS
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-
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DIN
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20MnMoNi4-5
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BS
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-
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GOST
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-
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AISI
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-
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UNI
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-
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NF
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-
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Chemical analysis -% by mass *
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Chemical elements
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C
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Si
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Mn
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P
max.
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S
max.
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Cr
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Mo
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Ni**
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-
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%, by mass
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0,17- 0,23
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£ 0,40
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1,00-1,50
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0.035
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0.035
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£ 0,50
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0,45-0,60
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0,40-0,80
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-
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Permissible deviation
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± 0,02
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+ 0,03
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± 0,06
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+ 0,005
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+ 0,005
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+ 0,05
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± 0,06
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± 0,05
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-
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* At the option the manufacturer the elements aluminium,
titanium, vanadium and niobium may be added singly or in combination for grain
control
purposes. Elements not quoted in tables shall not be added
intentionally to the steel without the agreement of the purchaser, except for
the purpose
of finishing the heat.
** For greater cross-sections up to 1,00 % Ni is
admissible.
Mechanical properties in the quenched and tempered condition
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Thickness of ruling section tR
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Diameter in mm
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tR ≤ 160mm
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160< tR ≤330mm
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330<tR≤660mm
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Re min. (N/mm2)
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420
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390
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-
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Rm min. (N/mm2)
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580
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550
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-
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A % min.
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l-longitudinal
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17
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17
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-
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tr - transverse
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14
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14
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-
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KV min (J)
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l-longitudinal
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39
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39
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-
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tr - transverse
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24
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24
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-
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1N/mm2=1MPa
Heat treatment conditions ****
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Quenching temperature, 0C
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Tempering temperature, 0C
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870 to 940
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630 to 680
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**** Quenching from hardening
may be carried out in oil, water, or water based solutions. Caution
should be observed in the use of water as a
quenching medium
to avoid the risk of cracking the forgings |
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Zeljezara Niksic - Niksic, Montenegro
Phone: (+382) 20 234-616, (+382) 40 202 900 | Fax: (+382) 40 202-023
 | Website: www.znksteel.com
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