Steel Tube Knowledge: Development of Seamless Steel Tube with Internal Thread for High Pressure Boiler

Introduction Internally-threaded steel pipe is a special-shaped steel pipe with spiral ribs on its inner surface. Due to its internal wall with concave and convex internal threads, it can effectively overcome the laminar flow phenomenon caused by the slow flow of medium in the steel pipe and suppress the steam film on the inner wall of the steel pipe. The effect, therefore, greatly improves the heat transfer effect of the boiler water wall and makes the wall temperature more uniform. Electric boilers are widely used. Due to the high requirements for internal thread steel pipe, mass production has a certain degree of difficulty, so currently there are only a handful of manufacturers with the capability of producing seamless steel tubes for multi-end internal thread boilers.
Uses Internally-threaded steel pipe materials are generally SA-210A1, SA-210C, SA-213T2, SA-213T12, and 15CrMoG. German Siemens Company developed an optimized internal thread steel pipe based on ordinary internal thread steel pipe. Its spiral angle of rise (angle between the spiral line and the axis) is larger and the thread height is higher, which further improves the heat transfer efficiency of the steel pipe; the material is T12, T23, etc., used in ultra-supercritical boiler water wall.
Specification Standard Number: GB/T
Chinese Standard Name: StandardTitle in English: Internally threaded seamless steel pipe for high pressure boilers English Standard Name: Multi-rifled seamless steel tubes for high-pressure boiler
Release Date IssuanceDate : 2006-08-16
Implementation Date ExecuteDate:2007-01-01
First release date FirstIssuance Date : 2006-08-16
Standard Status: Current Review Confirmation Date ReviewAffirmance Date :
Plan No. Plan No.:-T-605
Replaced by the national label ReplacedStandard:
ReplacedStandard:
Decommissioned Date RevocatoryDate :
Adopt International Standard No. Adopted International Standard No:
Adopted name AdoptedInternational Standard Name:
Adopt Degree ApplicationDegree :
Adopt international standard Adopted International Standard:
International Standard Classification Number (ICS): 77.140.75
Chinese Standard Classification Number (CCS): H48
Standard Category StandardSort: Product Standard Page Number ofPages:
Standard price (yuan) Price(Â¥) :
Administered by the department: Governor: Technical Committees of the China Iron and Steel Association: Drafting Committee of the National Steel Standardization Technical Committee Drafting Committee: Shanghai Special Steel Tube Co., Ltd., Metallurgical Industry Information Standard Institute, Wuxi Zhenda Steel Pipe Manufacturing Co., Ltd.

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