镀铜外管、碳钢内衬管、精密加工的密封垫表面以及全扩展的管深度，保证了高效和稳定的性能。
Combined with copper outer tubes, carbon steel inner tubes, precision machined gasket surfaces, and fully expanded tube depth, this design assures efficient, dependable performance.
2011年起供内蒙古东华能源有限责任公司合成碳钢管道和外管项目用合金管和碳钢管。
Since 2011 carbon and alloy steel seamless pipes for synthesis of carbon steel pipe and outer pipe project of Inner Mongolia Donghua Energy Co., Ltd.
该汽缸活塞杆由碳钢制成，外著一层防护涂层，以增强其运转性能并使其具有防腐功能。
The cylinder piston rod is made of carbon steel and is provided with a surface coating to improve the running characteristics and to prevent corrosion.
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