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black surface 4140 alloy steel round bar

Katalor Steel is a reliable and professional steel supplier ( black surface 4140 alloy steel round bar, Plate , Coil , Round Bar ,Flat bar , Angles , Structure Steel , RHS ,SHS ) in China and we also can do some fabrication process such as Cutting, Drilling, Turning, Milling, Welding service.


We are a manufacturer & exporter of black surface 4140 alloy steel round bar for more than 13 years with reliable quality, competitive price and fast delivery.


Our good quality is built on superior mechanical equipment, imported from Germany, Japan, Italy, etc. We have certifications ISO9001:2008 and others to control our quality, so we have received lots of reputations from our customers especial Europe.


We also occupy 5 factories of 5,600 square meters with annual production capacity of 2,000,000 MT.


Our projects covering oil & gas pipeline, drilling, offshore, energy, engineering & construction industries,black surface 4140 alloy steel round bar, etc. If needed, full e-catalog and projects lists and be provided.



We can supply:
- black surface 4140 alloy steel round bar
- Carbon/Alloy Seamless Steel Pipe (OD 1/4 inch-30inch, W.T 1.25mm to 50mm)
- ERW/LSAW/DSAW Steel Pipe (OD 1/2 inch-52inch, W.T 1.65mm to 25mm)
- Spirally Welded Steel Pipe (OD 219mm-3120mm, W.T 3mm to 25mm)
- Etc.


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