Underground Support Rods 20# A36 Q195 Q235D Q345b S355jr Carbon Steel Round Bars Yel AISI 4140 4130 4320 4340 Black Bright Alloy Steel Round Bar Rod Mold Tool

Nov 11, 2025

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Diameter

10-400mm/as you required

Length

1-12m/as you required

Shape

Round,Square,Rectangular,etc.

Standard

AISI,ASTM,DIN,JIS,GB ,JIS,SUS,EN,etc

MOQ

5Tons

Technique

Hot Rolled/Cold Drawn

Surface Treatment

1. Galvanized 2. PVC,Black and color painting 3. Transparent oil,anti-rust oil 4. According to clients requirement

The tolerance

±0.5mm

Material

GB: Q195, Q215, Q235A, Q235B, Q235C, Q235D, Q255A, 255B, Q275, Q295A, Q295B, Q345B, Q345C, Q345D, Q345E, Q390A, Q390B, Q390C,
Q390D, Q390E, Q420, Q420B, Q420C, Q420D, Q420E, Q460D, Q460E, Q500D, Q500E, Q550D, Q550E, Q620D, Q620E, Q690D, Q690E,etc.

EN:S185,S235JR, S275JR, S355JR, S420NL, S460NL S500Q, S550Q, S620Q, S690Q ,etc.
ASTM: Grade B, Grade C, Grade D, A36, Grade 36, Grade 40, Grade42, Grade 50, Grade 55, Grade 60, Grade 65, Grade 80,4130,4140,5160.etc.
JIS: SS330, SS400, SPFC, SPHD, SPHE,etc.

Application

Widely used in mechanical manufacture,construction field,farm vehicles,agriculture greenhouse,automotive
industry,railway,decoration,steel structure,etc.

Shipment Time

200ton:Within 5days after deposit Customize Size:Within 10days after deposit OEM Product: Within 15 days after deposit

Shipment Time

20000Tons/Month

Underground Support Rods 20# A36 Q195 Q235D Q345b S355jr Carbon Steel Round Bars Yel AISI 4140 4130 4320 4340 Black Bright Alloy Steel Round Bar Rod Mold Tool

1.What is a carbon steel bar?

 

 Carbon steel bars are elongated products made primarily of carbon and iron, featuring varying amounts of carbon content. They are distinguished from other steel bars by their increased tensile strength, durability, and malleability.

 

2.Is carbon steel stronger than steel?

High Carbon Steel offers the greatest strength and hardness over its counterparts, low and medium carbon steel. However, the steel is less ductile due to the higher carbon rate, meaning harder to machine, cut, and weld.

 

3.Is carbon steel rust proof?

All carbon steels are susceptible to rust, making them unfit for use in a wide variety of end-use applications. Overall, carbon steel is excellent if you're looking for a low-cost metal, but generally unfit for high-quality or high-precision manufacturing operations.

 

4.Is grade 8.8 carbon steel?

Description of Material. BS EN ISO 898–1 Grade 8.8 is a carbon alloy steel used throughout the general engineering sector for mechanical jointing of components.

 

5.What are the disadvantages of carbon steel?

Carbon Steel Disadvantages
Carbon steel is tough to work with since it is so robust, it is difficult to bend and mold into diverse shapes, restricting its applicability in some applications. Carbon steel is also more prone to rust and corrosion than other steel types.