Data show that as of November 16, the price of HRB40020mm rebar in Shanghai increased by 200 yuan to 4130 yuan/ton from the previous week, an increase of 5.1%; the main rebar futures contract rose by 70 yuan to 3852 yuan/ton, an increase of 1.9%, based on The gap widened substantially. The apparent
The rust of steel in the atmosphere is the corrosion phenomenon of iron ionization to form unprotected iron oxides (rust), while the rust of 304 stainless steel pipe is also a kind of corrosion phenomenon. The difference is in the atmosphere. The ionization of iron and chromium in stainless steel
Since 2020, the overall performance of billet prices has been strong. In the early stage, due to public health incidents, the billet price once fell to a low of 3000 yuan/ton. With the gradual recovery of downstream terminal demand, the overall billet price has risen, especially after April. The pri
1. Required equipmentA set of manual electric welding equipment, a handle angle grinder, an electric hammer, and a plane ruler.2. Preparation before welding1. Check and debug the equipment to ensure the normal operation of the equipment; 2. It is best to dry the φ4.0J402 electrode at 300℃-350℃ for o
Bend pipes are widely used in various industries. Products in air conditioners, refrigerators, automobile oil circuits, heat exchangers, aerospace, etc. are inseparable from the use of stainless steel pipes. Bend pipes are very commonly used in pipeline installation projects.
Generally speaking, the diameter of steel pipes can be divided into outer diameter, inner diameter, and nominal diameter. The outer diameter of the pipe is a hot-dip galvanized seamless steel pipe with the letter D, followed by the size and wall thickness of the outer diameter.
The hot-dip galvanizing technology of seamless steel pipes can usually be divided into two types: dip plating and blow platingDip plating: direct water cooling after immersion plating, average thickness of zinc layer is more than 70 microns, galvanizing cost is high, zinc usage is large, used in nor
Thermal expansion is a processing method of steel pipes, which is to process small-diameter steel pipes into large-diameter steel pipes. The mechanical properties of hot-expanded steel pipes are slightly worse than those of hot-rolled steel pipes. Limited to the limited specifications of seamless st
Carbon steel pipes with square and rectangular (rectangular) cross-sections: Weight unit per meter: kg/m (kilogram/meter) & lb/ft (lb/ft) Commonly used square tube calculation formula 1: (Length + width)×2÷3.14-thickness×thickness×0.02466= kg/m Formula 2: Kg/m = (Oc-4Wt) * Wt * 0.00785
(7) There should be a certain passage between the stack and the stack, and the inspection channel is generally 0. 5m, the access channel depends on the size of the material and the transportation machinery, generally 1.5～2. Om(8) Raise the bottom of the stack, if the warehouse is a sunny cement floo