Hot Rolled Steel Tubes

Size:20*20-500*500mm
Thickness:1.3-40mm
Length:5.8m/6m/12m

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Description

Product Specification

Specification	Size	2020-500500mm or as the requirement
	Thickness	1.3-40mm or as the requirement
	Length	5.8m/6m/12m or as the requirement
Technique	ERW, SSAW, LSAW, galvanized, etc.
Steel grades	ASTM A500, ASTM A501, EN10219, EN10210, JIS G3466, CSA G40.21 50W / 350W, AS 1136, AH36, DH36, ASTM A572 Gr50 , ASTM A513, etc.
Application	Bridge shipbuilding Steel Structures i.e. Airports, Facotry Workshop, Metro Station, etc.
Package	in the bundle, or wrapped with the waterproof cloth as per the customers' requirement
Delivery Time	5-10 days if stock is available; 20-25 days for new production
Loading Port	Xingang, Tianjin, China
MOQ	10 tons
Others	1. All the pipes are high-frequency welded.
	2. Both inner and outer welded stabs can be removed.
	3. Pipe can be necked down and punched holes.
	4. Supplying BV or SGS Inspection if the client needs it.

hot rolled steel tubes

Features of hot-rolled rectangular steel:

1. The material is uniform, and the cold-drawn or normalized state has lower hardness and higher strength than the annealed state.

2. Good processing performance: It is generally used to manufacture parts with high dimensional accuracy and complex shapes, which not only improves work efficiency but also saves materials and processing costs.

3. Good weldability: various forming techniques (crimping, bending, etc.) are acceptable.

4. After heat treatment, a relatively uniform residual stress layer can be obtained, which is beneficial to subsequent mechanical processing;

5. High hardenability (up to 60-100mm), good plasticity when hardened in oil;

6. No temper brittleness;

7. Good corrosion resistance and oxidation resistance at low temperatures;

8. Good delivery status: deliver with normalizing organization.

The production process of hot-rolled square tube:

1. Raw material preparation:

(1) Billet—round tube billet—heating furnace to 850-900°C → heat preservation for a period of time → slow cooling → billet opening machine to make the temperature uniform → roller-type continuous casting machine injects molten steel into the mold and solidifies quickly Capillary forming→cutting into finished tubes of required length and wall thickness—inspecting and removing surface defects and internal defects—packing and warehousing.

(2) Raw material inspection:

Chemical composition analysis and mechanical performance testing of raw materials:

2. Forming:

(1) Walking beam automatic welding:

Continuous welding production is carried out by a computer-controlled walking jog operating device. The computer controls the parameters of each process to realize the programmed operation to ensure stable and reliable product quality and production efficiency. The production line has the advantages of a high degree of automation (all processes are automated) and low labor intensity.

(1) The wire feeding device adopts a pneumatic wire feeding system controlled by a PLC control system;

(2) The welding head is clamped by a special hydraulic cylinder;

(3) The electric control system adopts an imported touchscreen programming controller;

(4) The seam tracking system is monitored by industrial TV;

(5) The weld testing equipment is an ultrasonic flaw detector;

(6) The gas circulation system is a dedicated gas delivery pipeline;

(7) The electrical control system uses imported frequency converters to control the operation of the motor and the working power of electrical components.

(8) The structure of the whole machine is reasonable and compact, and the appearance is beautiful and generous.