Examples of marking seamless steel pipes for low and medium pressure boilers
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Examples of marking seamless steel pipes for low and medium pressure boilers
Steel pipe with an outer diameter of 76mm and a wall thickness of 3.5mm made of No. 10 steel; the outer diameter and wall thickness of the hot-rolled steel pipe are of ordinary precision, and the length is 3000mm times the ruler 10-76X3.5X3000 times one GB3087-1999; cold drawn (Rolling) The outer diameter of the steel pipe is of high precision, the wall thickness is of ordinary precision, and the length is 5000mm. Cold 10-76 high X3.5X5000-GB3087-1999.
Manufacturing method of seamless steel pipe for low and medium pressure boiler
1. Steel manufacturing method-steel should be manufactured by electric furnace, oxygen converter or open hearth method. When the purchaser specifies a manufacturing method, it should be specified in the contract. The steel directly using continuous casting billet must be refined outside the furnace.
2. The manufacturing method of the tube billet-the tube billet can be manufactured by hot rolling method, or continuous casting billet name steel ingot, and the hot rolled tube billet shall meet the requirements of YB/T5222.
3. The manufacturing method of the steel pipe-the steel pipe can be manufactured by hot rolling (extrusion, expansion) or cold drawing (rolling) seamless method, and the purchaser shall specify a certain manufacturing method in the contract.
Shape and wall thickness of seamless steel pipe for low and medium pressure boiler
1. The outer diameter, wall thickness and theoretical weight of the steel pipe should meet the requirements of Table 1 of GB/T17395-1998. After negotiation between the supplier and the buyer, steel pipes with specifications other than those specified in Table 1 of GB/T17395-1998 can be supplied.
2. The allowable deviation of outer diameter and wall thickness should meet the requirements of Table 1. When the buyer requires high-level precision to be supplied, it should be specified in the contract.
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