小口徑方管用作煉鋼吹氧用管，冶煉吹氧用鋼管一般用焊接鋼管，規格由3/8寸-2寸八種。用或Q195-Q235鋼帶制成。為防蝕，有的進行滲鋁處理。是在S系列產品基礎上研制而成，天津吹氧管，結合了當前電弧爐煉鋼的實際需要，耐火度高、消耗量少、操作方便等特點。電弧爐煉鋼中輸送氧氣或其它氣體，在電弧爐內熔化并精煉鋼鐵。

Small caliber square pipe is used as oxygen blowing pipe in steelmaking. Welded steel pipe is generally used for oxygen blowing pipe in steelmaking. The specifications range from 3/8 inch to 2 inch. Made of or Q195-Q235 steel strip. In order to prevent corrosion, some are aluminized. It is developed on the basis of S series products. Tianjin oxygen blowing pipe combines the actual needs of electric arc furnace steelmaking. It has the characteristics of high refractory, low consumption and easy operation. In electric arc furnace steelmaking, oxygen or other gases are transported to melt and refine steel in the electric arc furnace. 小口徑方管冶煉吹氧用鋼管按焊接方法不同可分為電弧方管、高頻或低頻電阻方管。電焊鋼管用于石油鉆采和機械制造業等，可用作水煤氣管等，大口徑直縫方管用于高壓油氣輸送。吹氧管廠家生產的擴口吹氧管，強度一般比直縫方管高，能用較窄的坯料生產管徑較大的方管，還可以用同樣寬度的坯料生產管徑不同的方管。但是與相同長度的直縫管相比，焊縫長度增加30~100%，而且生產速度較低。因此，較小口徑的方管大都采用小口徑方管，大口徑方管則大多采用螺旋焊。

Small caliber square pipe for oxygen blowing can be divided into arc square pipe, high frequency resistance square pipe or low frequency resistance square pipe according to different welding methods. Welded steel pipes are used in oil drilling and mechanical manufacturing, water gas pipes, etc. Large diameter straight seam square pipes are used for high pressure oil and gas transmission. Oxygen blowing tube manufacturer's enlarged oxygen blowing tube has higher strength than straight slotted square tube. It can produce square tube with bigger diameter with narrower blank, and can also produce tube with different diameter with the same width blank. However, compared with the straight seam pipe of the same length, the length of the weld increases by 30-100%, and the production speed is lower. Therefore, the small diameter square pipe is mostly used, while the large diameter square pipe is mostly spiral welded.