Description

Forged steel round bars (commonly known as “forged round bars”) are circular cross-section steel bars made from steel ingots or rolled products. These are heated and then forged using processes such as free forging and die forging to apply impact or pressure, causing plastic deformation.

Forged steel round bars typically have a smooth, unblemished surface (unlike steel rebar). Domestic production diameters range from Φ80-1500 mm, with custom lengths and subsequent heat treatment available. Compared to hot-rolled round bars of the same material, they exhibit significantly higher strength, toughness, and fatigue resistance, and can withstand greater impact loads and alternating stresses.

Characteristics of Forged Steel Round Bars:

1. Dense and Defect-Free Structure: The forging process eliminates porosity, shrinkage cavities, and inclusions within the steel ingot, resulting in refined and orderly arranged metal grains, significantly improving material purity.

2. High Strength and High Toughness: Due to the directional reinforcement of grain flow along the contour, forged round bars exhibit excellent tensile strength, yield strength, and impact toughness, enabling them to withstand greater sudden loads. 3. Excellent fatigue resistance: The continuous fibrous structure makes Forged Steel Round Bar less prone to cracking under alternating stress, resulting in a fatigue life far exceeding that of cast or conventionally rolled materials.

4. Large-scale customization capability: Forged Steel Round Bar diameters typically range from Φ80-1200 mm (some up to 1500 mm), and non-standard lengths and special materials (such as alloy structural steel bar and stainless steel bars) are supported for customization.

5. Rigorous quality inspection: After production, Forged Steel Round Bars typically undergo ultrasonic testing (e.g., GB/T 6402 standard) and chemical composition analysis to ensure the absence of hidden defects.

6. Surface and tolerance characteristics: The surface of the black-skinned version is relatively smooth and texture-free, but dimensional tolerances are slightly wider than those of cold-drawn steel round bars (e.g., black-skinned diameter tolerance is approximately -0/+3~5 mm), and high straightness requirements are necessary (typically ≤3 mm/1000 mm).

Applications of Forged Steel Round Bars:

Forged round bars, due to the forging process, have refined internal grains and a denser microstructure, resulting in higher strength, toughness, and fatigue resistance than hot-rolled round bars of the same material. They are primarily used in the manufacture of critical components with extremely high reliability requirements.

1. Heavy Machinery and Construction Machinery: Forged steel round bars are used to manufacture shafts, gears, connecting rods, camshafts, and large structural components that bear high loads, ensuring they are not easily broken under impact loads.

2. Automotive Manufacturing: Forged steel round bars are used in key moving parts such as engine crankshafts, connecting rods, transmission half-shafts, and gears to meet the demands of high-speed and high-torque operating conditions.

3. Energy and Power Equipment: Forged steel round bars are widely used in wind turbine main shafts, turbine/generator rotors, high-pressure boiler components, and key forgings in nuclear power equipment, requiring materials with excellent creep resistance and fatigue resistance.

4. Aerospace and Marine Engineering: Forged steel round bars are used in the manufacture of landing gear components, aircraft engine parts, marine propulsion shafts, and high-strength connectors. They require rigorous ultrasonic testing to eliminate internal defects.

5. Die and Tool Manufacturing: High-alloy forged round bars (such as Cr12MoV) are used to manufacture large, complex, and impact-exposed cold/hot work dies, punches, and wear-resistant tools, extending their service life.

Specifications of the Steel Round Bar:

Carbon Structural Steel Bright Round Bar	C10 C20 C35 C45 c55 St37-2 St37-3 St44-2 St44-3 St52-3	S10C S20C S25C S35C S45C S48C S50C S55C	1010 1020 1035 1045 1055	10# 20# 25# 35# 45# 20Mn 45Mn
Low – Alloy High – Strength Structural Steel Bright Round Bar	S235JR S235J0 S235J2 S275JR S275J0 S275J2 S355JR S355J0	S355J2 S275J0G3 S275J2G4 S355J2G3 S355J2G4 S355k2G3 S355K2G4 S355K2 S355J2G4	S275N S355N S355NL S420N S420NL S460N S460NL	Q355B Q355D Q390B Q390D
Alloy Structural Steel Bright Round Bar	20Mn2 30Mn2 40Mn2 20Cr 40Cr 15CrMo 20CrMo 30CrMo 42CrMo 41Cr4 16MnCr5 42CrMoS4	12Cr1MoV 20CrMnTi 20CrNiMo 40CrNiMo SAE1541 4120 4135 4140 4320 4340 8620H SCM415 SCM420	SCM430 SCM435 SCM440 SCr420 SCr420H SCr435 SCr440 34CrMo4 SNCM439 34Cr4	42CrMo4 39NiCrMo3 34CrNiMo6 18CrMo4 20NiCrMo2-2
Inconel Alloy Superalloys	Inconel601 InconeX750 Inconel600 Incoloy825 Inconel718	Incoloy800H Incoloy 800H Incoloy800 Inconel625 Inconel625 Inconel690	GH4099 GH128 GH145 GH169 GH605 GH3536 GH4033 GH99 GH625 GH4080AGH2132	GH132 GH500 GH600 GH536 GH4141 GH141 GH3625 GH2747 GH188 GH2696 GH747 GH3030

Diameter (mm)	Theoretical Weight (kg/m)	Diameter (mm)	Theoretical Weight (kg/m)
5.5	0.186	13	1.04
6	0.222	14	1.21
6.5	0.26	15	1.39
7	0.302	16	1.58
8	0.395	17	1.78
9	0.499	18	2
10	0.617	19	2.23
* 11	0.746	20	2.47
12	0.888	21	2.72
22	2.98	63	24.5
* 23	3.26	* 65	26
24	3.55	* 68	28.5
25	3.85	70	30.2
26	4.17	75	34.7
* 27	4.49	80	39.5
28	4.83	85	44.5
* 29	5.18	90	49.9
30	5.55	95	55.6
* 31	5.92	100	61.7
32	6.31	105	68
* 33	6.71	110	74.6
34	7.13	115	81.5
* 35	7.55	120	88.8
36	7.99	125	96.3
38	8.9	130	104
40	9.86	140	121
42	10.9	150	139
45	12.5	160	158
48	14.2	170	178
50	15.4	180	200
53	17.3	190	223
* 55	18.6	200	247
56	19.3	220	298
* 58	20.7	250	385
60	22.2

Products	Round Steel bar
Dia	5.5mm~650mm
Length	3m,6m,9m,12m
Standard	ASTM A 615 Gr 40/60,BSS4449 Gr460B,500B etc
Material	3Cr2Mo/1.2311/1.2312/P20/1.2738/718H/P20+Ni/1.2316/1.2083/4Cr13 /sus420j2/420/S136/NAK80H13/1.2344/SKD61/5CrNiMo/SKT4/1.2714 Cr12/D3/1.2080/Cr12MoV/D2/1.2379/SKD11/9CrWMn/O1/1.2510/SKS3 /DC53 40Cr/5140/35CrMo/42CrMo/4140/1.7225 C45/C50/1045/1050/S50C/S45C/T10/T8 M2/1.338/SKH51
Surface	ASTM，AISI，JIS，GB， DIN，EN
Technique	Hot rolled / cold rolled
Surface	Black Finish ,Oiled,Shot Blasted,Spray Paint,Coated,Galvanized,
Surface	Or as Your Request
Package	In bundle, no other package or wrapped with waterproof, or as customers’ requirement
Payment Term	T/T, L/C at sight,West Union,Paypal
Price Term	FOB,CRF,CIF,EXW all acceptable

S45C	0.42~0.48	0.60~0.90	0.15~0.35	≤0.03	≤0.03	≤0.20	≤0.20	≤0.30	_	_	JIS G4051-2005
S20C	0.18~0.23	0.30~0.60	0.15~0.35	≤0.03	≤0.035	≤0.20	≤0.20	≤0.30	_	_	JIS G4051-2005
ASTM A36	≤0.22	0.50~0.90	≤0.40	≤0.040	≤0.050	≤0.20	≤0.20	≤0.30	≥250	400~500	ASTM A36/A36M-03a
ASTM A105	≤0.35	0.6-1.05	≤0.35	≤0.050	≤0.040	≤0.20	≤0.20	≤0.30	≥310	485~620	ASTM A105/A105M
SAE1013	0.11~0.16	0.50~0.80	_	≤0.040	≤0.050	≤0.20	≤0.20	≤0.30	_	_	ASTM A568/A568M-91a
SAE1015	0.13~0.18	0.30~0.60	_	≤0.040	≤0.050	≤0.20	≤0.20	≤0.30	_	_
SAE1017	0.15~0.20	0.30~0.60	_	≤0.040	≤0.050	≤0.20	≤0.20	≤0.30	_	_
SAE1018	0.15~0.20	0.60~0.90	_	≤0.040	≤0.050	≤0.20	≤0.20	≤0.30	_	_
SAE1020	0.18~0.23	0.30~0.60	_	≤0.040	≤0.050	≤0.20	≤0.20	≤0.30	_	_
S235JR	0.15~0.20	≤1.4	_	≤0.035	≤0.035	≤0.20	_	_	≥235	400~510	EN10025
S275JR	≤0.22	≤1.4	_	≤0.035	≤0.035	≤0.20	_	_	≥275	490~610	EN10025
ST37-2	0.17~0.20	≤1.4	_	≤0.045	≤0.045	≤0.20	_	_	≥235