Project Description

SNCM630 steel Manufacturer and Exporter,supplied with round,square,flat,block,and shaft etc.

SNCM 630 steel belongs to alloy steel in Japanese grade standard JIS G4103. It contains nearly 3% Ni, 3% Cr and a small amount of 0.5% Mo which belongs to the Ni-Cr-Mo series of steels.

This type of steel mainly for machine structural use manufactured by hot forming,such as hot rolling and forging, ordinarily used after further processes of forging.SNCM630 steel is generally delivered in an annealed condition.

SNCM630 Forged steel with annealed condition

SNCM630 STEEL SUPPLY FORM & SIZE & TOLERANCE

Hot Forged Round bar:Φ80-Φ1000mm

Hot Rolled  Round bar:Φ16-Φ130mm

Hot Forged Square bar: Max Thickness:500mm

Flat bar/Blcoks:Thickness :120-800mm ,Width:120-1500mm

Surface FinishBlack-Forged Black-Rolled Turned   GrindingPolishedPeeledCold Drawn
Tolerance(0,+5mm)(0,+1mm)(0,+3mm)Best h9Best h11Best H11Best H11

SNCM630 STEEL CHEMICAL COMPOSITION AS PER JIS G4103

GradeCSiMnPSCrNiMo
SNCM6300.25-0.350.15-0.350.35-0.60≤0.03≤0.032.5-3.52.5-3.50.5-0.7

SNCM630 STEEL EQUIVALENT GRADE

China/GB:30Cr3Ni3Mo

SNCM630 STEEL FORGING

The billets of SNCM630 steel  should be annealed to release internal stress caused by casting before foging.Recommended Forging temperature:850℃- 1180℃.Never forge it below 850 degrees, otherwise the material will harden and crack.

Once the forging is completed, SNCM630 steel should be sent to the annealing furnace as soon as possible.The purpose is to soften the hardness for further processing, the second is to release the internal stress caused by the forging, and the third is to be a high-sensitive white spot material with hydrogen elimination treatment.

SNCM630 STEEL HEAT TREATMENT 

  • Annealing

Heat the steel to the temperaure  830-870ºC,and enough soaking time for the steel heating, Cool slowly in the furnace with hardness below 269HBW.

  • Quenching

Quenching temperature is carried out from an austenitizing temperature of 850-900ºC with several heating steps,keep suitable time for the steel to be thoroughly heated,  oil quenching is recommended.

SNCM630 Steel Quenching Diagram

JIS SNCM630 Steel Quenching Diagram

  • Tempering

Tempering process should be followed after quenching immediately.Tempering at a suitable temperature 550-650ºC .

SNCM630 steel Tempering Diagram

JIS SNCM630 Steel Tempering Diagram

SNCM630 STEEL MECHANICAL PROPERTY WITH QUENCHED AND TEMPERED CONDITION

  • SNCM630 Steel Mechanical Property with Different Quenching & Tempering Temperature
Heat treatment processTensile performance at room temperature

Recommended data
Quenching Temperature,ºC Tempering Temperature,ºC Tensile,
Mpa
Yield,
Mpa
Elongation,
%
Reduction,
%
850-900550-650≥1080≥885≥15≥45








Test Data


850
560135511801651.5
580106090018.562
600105087518.561
620101085020.566


880
5601195103018.562.5
580108090519.564.5
600106089520.566
6209958302167.5


900
560128010951758
580115599518.564.5
60010108352164.5
6209808002163
  • SNCM630 Steel Impact Data at room temperature with Different Quenching & Tempering Temperature

Tempering Temperature,ºC
Quenching Temperature,ºC
860880900
56032J78J51J
58092J90J84J
60096J100J114J
620110J120J94J
  • SNCM630 Steel Hardness Data at room temperature with Different Quenching & Tempering Temperature

Tempering Temperature,ºC
Quenching Temperature,ºC
860880900
Requirement:302-352HB
560415317388
580321337345
600309329325
620309317302
  • SNCM630 Steel Grain size Data at room temperature with Different Quenching & Tempering Temperature

Tempering Temperature,ºC
Quenching Temperature,ºC
860880900
5606.56.06.0
5805.06.58.0
6005.58.07.5
6207.56.06.5
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