Achieve the desired processing conditions. Its performance is changing the use of higher value than the average of seamless steel containing Cr alloy tube chemical composition more, high temperature, low temperature resistance, corrosion-resistant performance. Carbon seamless pipe without alloy composition or alloy composition little more extensive use of alloy pipe in the petroleum, aerospace, chemical, electric power, boiler, military and other industries because of the many changes of the mechanical properties of the alloy tube adjustment.