Typical applications of SAE 4130 steel include aircraft structural parts, aircraft fuel pipes, frames and accessories, automobile frames, shafts, spindles, steering wheels, bolts, studs, gears, drill pipes

SAE 4130 STEEL CHEMICAL COMPOSITION

Grade	C	Si	Mn	P	S	Cr	Mo
4130	0.28-0.33	0.15-0.35	0.4-0.6	≤0.035	≤0.04	0.8-1.1	0.15-0.25

SAE 4130 STEEL RELATED STANDARD & EQUIVALENT GRADE

CHINA | GB 3077:30CrMoA

Europe | EN10083 | EN10250:25CrMo4/1.7218

JAPAN | JIS G4105:SCM430

UK | BS970:708M25/708A25

QUICK FAQS FOR SAE 4130 STEEL

What is the difference between AISI 4130 and SAE 4130?

SAE 4130 and AISI 4130 belong to different associations. Both are essentially 4130 steel, so in practical applications, there is basically no difference in treatment.

4130 Steel VS 30CrMoA

4130 is an American steel grade, while 30CrMoA is a Chinese steel grade. As can be seen from the table below, the chemical compositions of the two are very similar, and they belong to the chromium-molybdenum series of low-alloy high-strength structural steels.

Grade	C	Si	Mn	P	S	Cr	Mo
4130	0.28-0.33	0.15-0.35	0.4-0.6	≤0.035	≤0.04	0.8-1.1	0.15-0.25
30CrMoA	0.26-0.34	0.17-0.37	0.4-0.7	≤0.035	≤0.035	0.8-1.1	0.15-0.25

This type of steel is usually used in the oil and gas field. There are two performance requirements for 4130 in the quenched and tempered condition: the minimum yield strength is 60K (414Mpa) and 75K (517Mpa).

What does the commonly mentioned 4130 75K mean?

4130 75K means that after quenching and tempering, the yield strength of 4130 steel must reach a minimum of 75K (517Mpa).

In API 6A, there is not only one requirement for yield strength, but also other requirements, as shown in the table below.

Material Designation	0.2% Offset yield strength Min,Mpa(ksi)	Tensile strength Min,Mpa(ksi)	Elongation in 50 mm (2 in) Min,%	Reduction in Area Min,%	Impact(-60℃) Min,J	Hardness HBW
75K	517(75)	655(95)	17	35	27	197-237

What is the processing performance of 4130 steel?

4130 steel has good hot and cold processing performance‌, and can be processed by cutting, stamping, cold drawing, welding, rolling, forging and other processing methods, which enables manufacturers to manufacture various complex parts to meet the needs of different projects.

In addition, 4130 steel has excellent heat treatment performance. Through different heat treatment processes, the performance of 4130 steel is further improved.

SAE 4130 STEEL FORGING

• Initial Forging Temperature：1200℃
• Final Forging Temperature： >800℃
• Forging Ratio：above 4:1
• Post-Forging Treatment:Cooling in sand slowly or furnace cooling after forged.

SAE 4130 STEEL HEAT TREATMENT

• Normalizing:880℃-900℃,Cool in air
• Annealing:800℃-850℃,Cool in furnace
• Hardening:870-890°C,oil quench
• Tempering:650-700°C, cool in still air,hardness:197-237HBW

 SAE 4130 steel 60K/75K Level Mechanical Property In Quenched & Tempered Condition 

	Tensile Strength Mpa	Yield Strength Mpa	Elongation %	Reduction of Area %	Hardness HB	Impact Charpy-V, -18ºC,J
60K	≥ 586	≥ 420	≥ 18	≥ 35	174-237	≥ 42
75K	≥ 655	≥ 517	≥ 17	≥ 35	197-237	≥ 33

SAE 4130 Steel 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 report
6.Grain size
7.Forging ratio
8.Ultrasonic test report

Supply Size & Condition For SAE 4130

• Round Bars:  Dia.80 – 1,000mm as Forged
• Flat / Square Bars:  Thickness Max.800mm
• Shafts, Rollers, Blocks:  Customized or According to Drawing
• Rolled Round Bars:  Dia.14 – 350mm with UT Assurance

Heat treatment:Quenched and Tempered (+QT), Normalizing (+N), Annealing (+A)
Surface finish:Black / Rough turned / Peeled