Professional Round Bar 4130 4140 4145 1020 1045 Alloy Steel Round Bar

Nov 04, 2025

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Product Description

 

Product Description

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Main Grade we can supply for forged steel bars

Steel series Representative steel type
Carbon Steel series AISI 1020,1045,A36,S355JR,S355JO
Petroleum machinery series AISI4150,AISI4140,AISI4130,
30CrMo,4145H
Tool mold series 1.2714,5CrMnMo,5CrNiMoV,
1.2738,1.2311,1.2312 1.2714 H13
Bearing series 52100,GCr15,SUJ2
Marine series 4140,42CrMo,SCM440,
709M40
Car series SAE8620,20CrNiMo,
SNCM220
Heavy-duty transmission series 40CrNiMo,SNCM439,
SAE4340,EN24
Mining machinery series 655M13,826M40,
25CrMo
Wind power gear series 18CrNiMo7-6, 17CrNiMo6, 1.6582,1.6587,SAE8620
Wind power spindle series 34CrNiMo6,817M40
Nitriding series 20MnCr5,38CrMoAl,
31CrMoV9
Pressure vessel series 15CrMo,13CrMo4-4
Metallurgical roll series 21CrMoV511,W1.7225,
EN19,709M40
COLD WORK TOOL STEEL
Grade AISI /ASTM DIN (W.Nr) JIS EN/ BS GB
DC53 higher than D2   SKD11 XW-5 Cr8Mo2Vsi
D2 D2 1.2379 SKD11 BD2 CR12MO1V1
Cr12MoV         CR12MOV
D3 D3 1.2080 SKD1 BD3 CR12
O1 O1 1.2510 SKS3   9CRWMN
HMD5   HMD5     7CrSiMnMoV
5CrNiMo L6 55NiCrMoV6 SKT4   5CrNiMo
52100 52100 1.3505   EN31 GCR15
HOT WORK TOOL STEEL
H13 H13 1.2344/1.2342 SKD61/DAC 8407 4CR5MOSIV1
FDAC   1.2347 FDAC   FDAC
H11 H11 1.2343 SKD6   H11
3Cr2W8V H21 1.2581/ X30WCrV93 SKD5 BH21 3CR2W8V
PLASTIC MOULD STEEL
P20 P20 1.2311 HPM7/PX88 618 3CR2MO
718 P20+NI 1.2738 PX4/PX5 718 3CR2NIMO
S136 420 1.2083 S-STAR S136 4CR13
NAK80 P21 /P20+S 1.2312 NAK80   15NI3MN
HIGH SPEED STEEL
M2 M2   SKH51   W6MO5CR4V2
M42 M42 S2-10-1-8 SKH59   W2MO9CR4VCO8
           
ALLOY STRUCTURE STEEL
Grade AISI /ASTM DIN (W.Nr) JIS EN/ BS GB
5120 5120 1.7027 /21Cr4 SCr420   20Cr
530M40 /5140 530M40 /5140 1.7035 /41Cr4 SCr440   40Cr
5145 5145   Scr445   45CR4
4118 4118 1.7243 /18CrMo4 SCM418 / SCM420   20CrMo
4135 4130 1.7218 /25CrMo4 SCM430 708A25/ 708M25 30CrMo
4140 4140 1.7225 /42CrMo4 SCM440 EN19/ 709M40 42CrMo
4340 4340 1.6582/ 34CrNiMo6 SNCM 439/ SNCM8 EN24/ 817M40 40CrNi2Mo
8620 8620 1.6523/ 21NiCrMo2 SNCM220 805M20 20CrNiMo
CARBON STEEL
20 1020 C22. CK22 S20C EN3B /070M20 20
35 1035 C35.CK35 S35C   35
45 1045 C45.CK45 S45C EN8D/C45E 45
50 1050 CK53 S50C EN9/070M55 50
Q355   S355J /ST52   EN14 Q355
30Mn 1030.1033   S30C   30Mn
30Mn2 1330 30Mn5 SMn433h   30Mn2
STAINLESS STEEL
steel grades: 304, 304L, 316, 316L, 321, 410 430, 431, 2205, 2304, 2507. F53, F55

 

Detailed Photos

Professional Round Bar 4130 4140 4145 1020 1045 Alloy Steel Round BarProfessional Round Bar 4130 4140 4145 1020 1045 Alloy Steel Round BarProfessional Round Bar 4130 4140 4145 1020 1045 Alloy Steel Round BarProfessional Round Bar 4130 4140 4145 1020 1045 Alloy Steel Round Bar

1.What is a round bar used for?

Round bar is a steel bar with a smooth surface which is used for construction that does not request high-strength reinforced concrete works. It is widely used on beam and column stirrups, pipelines, roads, small and medium-sized projects.

 

2.What type of steel is a round bar?

Mild steel round bars are made from low-carbon steel, which makes them ductile, easy to weld, and cost-effective. They are commonly used in general construction, fabrication, and manufacturing. MS round bars are ideal for projects where high strength isn't the primary requirement.

 

3.What is another name for a round bar?

The most common shapes are round bar (also called rod), rectangular bar (including square bar, the special case of equal sides), and hexagonal bar (usually called hex bar for short). Tube and pipe are similar, but have hollow centers and are traditionally not called "bar" in industrial usage.

 

4.What is stronger, round bar or square bar?

Square Bars: Thanks to their flat surfaces and defined edges, square bars handle pulling forces differently than round bars. They provide extra stability, especially when you need even tension across a flat surface.

 

5.Is a round bar solid?

A round bar is a solid metal rod with a consistent circular cross-section. These bars come in different thicknesses and lengths, depending on what they're needed for