China · GB

50

GB/T 17107:1997 — Structural steel grades and mechanical property for forgings

Chemical composition

ElementminmaxSimilarRemarks
C0.470.55
Cr0.25
Cu0.25
Mn0.50.8
Ni0.25
P0.035
S0.035
Si0.170.37

Mechanical properties

Heat treatment / conditionYield strengthTensile strengthElongationReduction of areaImpact energyHardness
forgings, > 100 <= 250 mm≥35
forgings, > 16 <= 40 mm≥35
forgings <= 100 mm, normalized and tempered≥35
forgings <= 16 mm≥30
forgings > 100 <= 300 mm, normalized and tempered≥33
forgings > 300 <= 500 mm, normalized and tempered≥30
forgings > 40 <= 100 mm≥40
forgings > 500 <= 750 mm, normalized and tempered≥28
forgings, normalized and tempered, <= 100 mm≥310≥610≥13≥23 Charpy U Notch
forgings, normalized and tempered, > 100 <= 300 mm≥295≥590≥12≥19 Charpy U Notch
forgings, normalized and tempered, > 300 <= 500 mm≥285≥570≥12≥19 Charpy U Notch
forgings, normalized and tempered, > 500 <= 750 mm≥265≥550≥12≥15 Charpy U Notch
forgings, , <= 16 mm≥500≥700≥14≥31 Charpy U Notch
forgings, , > 100 <= 250 mm≥345≥590≥17≥31 Charpy U Notch
forgings, , > 16 <= 40 mm≥430≥650≥16≥31 Charpy U Notch
forgings, , > 250 <= 500 mm≥345≥590≥17
forgings, , > 40 <= 100 mm≥370≥630≥17≥31 Charpy U Notch