Combined with the present status of coal market and the situation of simple product of the coal enterprises, the paper analyzes the future developing trend of coal market.

紧密结合当前煤炭市场实际，针对煤炭产品单一的现状，分析了煤炭企业今后的发展趋势。

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This article discusses the production, process, product technical condition, gear size and market status about inner thread cu tube of our country, and proposes its developing trend.

本文论述了我国内螺纹铜管业生产、工艺、产品技术条件、齿型及市场现状，提出了内螺纹铜管的研发方向。

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