AISI 4140 42CrMo Carbon Steel Bar High Strength Hot Rolled Rod Round Bar

Aug 20, 2025

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info-1085-442

Product Name

Carbon Steel Pipe

Standard

GB/T 700-2006,GB/T 1591-94,JIS G3101-2004,
ASTM A36/A36M-05,ASTM A242/A242M-04,ASTM A529/A529M-05,
ASTM A572/A572M-06,EN 10025-2-2004

Outer Dia

8mm-610mm

Dia Tolerance

Control with in the standard, OD:+-1%, WT:+-10%

Materials

Q195,Q215 A,Q215 B,Q235 A,Q235 B,Q235 C,
Q235D,Q275,Q275B,Q275C,Q275D,Q295,Q345,Q390,Q420, Q460,
SS330,SS400,SS490,SS540,A36,1,GR.36,50(245),55(380),42(290),
60(415),65(450),S185(1.0035),S235JO(1.0114), S235JR(1.0038),
S235J2(0.0117),S275JR(1.0044),S275JO(1.10143),S355JO(1.0553),
E295(1.0050),E335(1.0060), S235J2W(1.861),S355J2W(1.8965),10#,
15#20#

Inspection

ISO,BV,SGS,MTC

Packing

Waterproof paper, and steel strip packed. Standard Export Seaworthy Package.Suit forall kinds of transport,or as required

Supply Ability

1000 metric tons/month

MOQ

5metric ton,sample order accepted

Shipment time

Within 7-10 workdays after receiving deposit or L/C

Commonly Used Steel Types

Category Grades Sizes Standard
Carbon structure steel Q195,Q215,Q235,Q275 16mm-250mm GB/T700-2006
Low alloy high strength structure steel Q295,Q345,Q390,Q420, Q460 16mm-250mm GB/T1591-2008
Prime Carbon structure steel 10#, 20#, 35#, 45#, 60#, 20Mn,65Mn,B2, B3,JM20, SH45,S45C,C45 16mm-250mm GB/T699-1999
Alloy structure steel 30Mn2,40Mn2,27SiMn, 42Crmo, 20Cc40Cr,20CrMo, 35CrMo,20CrMnTi, 30CrMnTi,20MnVB, 20MnTiBf 45MnV 20CrNiMo, Q345B, 35MnBM,40MnB,36Mn2V 16mm-250mm GB/T3077-1999
Spring Steel 65Mn,60Si2Mn, 50CrVA 16mm-250mm GB/T1222-84
Bearing Steel GCr15tGCr15GD,55SiMoV 16mm-250mm GB/T18254-2002
Structural steels subject to end-quench hardenability requirements 20CrMnTi,30CrMnTi, 20Cr, 40Crf30CrMo,42CrMoA,27SiMn, 40Mn2H, 20CrNiMo, 40Mn2,q345b,35MnBM, 40MnB,45MnV. 16mm-250mm GB/T5216-2004
Oil wells structural steel 37Mn5,36Mn2V 16mm-250mm Q/LYS248-2007
Marine anchor chain steel CM490,CM690,M30Mn2 16mm-250mm YB/T66-1987 GB/T18669-2002

1. What is a round bar?

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 is the difference between a round bar and a rod?

 

Round bars often possess higher tensile strength and hardness, making them suitable for load-bearing applications. Meanwhile, rods offer increased flexibility and are more malleable, catering to intricate designs and bending requirements.

 

3.What is the primary use of a round bar?

round bars are vital in building infrastructure like bridges, skyscrapers, and residential homes. For example, TMT bars provide the strength and flexibility needed to reinforce concrete structures. Industries use round bars to create tools, machinery components, and automotive parts.

 

4.What is a round bar in construction?

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.

 

5.What is the difference between UC and UB steel?

In terms of identifying UBs and UCs, the depth of a universal beam is always greater than its width, making it more suited to carrying bending loads whereas universal columns are taller than they are wide to hold up against vertical loads as well as the forces of gravity.