AISI 4130+QT Steel Bars

AISI 4130+QT Steel Bars manufacturers and suppliers,supplied with round rods,square/flat bars,rollers,shafts,blocks and forging pieces.

AISI 4130+QT Steel Bars grade is a low-alloy steel including chromium and molybdenum as strengthening elements which has good strength and toughness,weldability and machinability. AISI 4130+QT Steel Bars is widely used in the oil and gas industry. Typical applications include components such as valve  bodies, pumps and fittings.

AISI 4130+QT Steel Bars Chemical Composition per ASTM A29; Mechanical Properties per API 6A – 60K,75K

GRADE	C	Si	Mn	P	S	Cr	Mo
4130+QT	0.28-0.33	0.15-0.35	0.40-0.60	≤ 0.035	≤ 0.040	0.80-1.10	0.15-0.25

AISI 4130+QT Steel Bars SIZE TOLERANCE&PROCESS

Shape	Size(mm)	Process	Tolerance	Length(mm)
Round	Φ6-Φ50	Cold Drawn	H11	3000-5800
Round	Φ40-Φ300	Hot Rolled	-0/+3mm	3000-10000
Round	Φ120-Φ1000	Hot Forged	-0/+3mm	3000-10000
Flat/Square/Block	Thickness:120-800 Width:120-1500	Hot Forged	-0/+3mm	500-6000

AISI 4130+QT Steel Bars HEAT TREATMENT

Normalizing For AISI 4130+QT Steel Bars
1.Nominal normalizing temperature:850-900°C
2.Hold the temperature for several hours
3.Cooling in the air

Annealing For AISI 4130+QT Steel Bars
1.Nominal Annealing temperature:690-720°C
2.Cool slowly in the furance
3.Maximum Brinell hardness of 225

Hardening and Tempering(QT) For AISI 4130+QT Steel Bars

1.Nominal Hardening temperature:860-890°C
2.Hold at this temperature then quench in oil or water
3.Tempering  as soon as possible when the temperature low to ambient
4.Heat uniformly to the suitable temperature of 550-640°C
5.keep the material out of the furnace ,then cool in the air

AISI 4130+QT Steel Bars MECHANICAL PROPERTY( FOR REFERENCE ONLY)

1.Tensile strength: 940MPa
2.Yield point: 790MPa
3.Percentage reduction of area after fracture: 52%
4.Elongation after fracture: 13%
5.Impact test (+20°C): Transverse – 27~35J; Longitud – 47~50J

AISI 4130+QT Steel Bars DELIVERY CONDITION

1.Shape:Round/Square / Flat/Shafts/Rollers/Blocks
2.Surface condition:Black surface/Bright surface
3.Heat Treatment:Normalized/Annealed/QT
4.Straightness:Max 3mm/m(Enhanced straightness may be available on request)
5.Length:3000-5800mm suitable for 20″container.  above 6000mm,suitable for 40″ container
6.Grain Size: 5-8 acc to ASTM E112-96
7.Ultrasonic Standard: Sep1921/ASTM A388/EN 10228-3
8.Typical Hardness:HB207-235
9.Non Metallic Inclusion: 2 max acc to ASTM E45 /K4≤20 acc to DIN 50602
10.Forging Ratio: minimum 4 : 1
11.Marking: Grade/Weight/Length/Size/Heat Number

AISI 4130+QT Steel Bars QUALITY CERTIFICATION

A material test report(Inspection Certificate EN 10204 3.1) will be provided, documenting the following:
1.Chemical analysis
2.Mechanical properties
3.Surface hardness
4.Non Metallic Inclusion
5.Heat Treatment Process
6.Grain size
7.Forging ratio
8.NDE test method/criteria