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我国四川等地有极其丰富的天然气资源,大力开发和利用天然气,对发展我国国民经济和备战备荒为人民都具有重大意义。由于四川气田的天然气中含有较多的硫化氢,对设备造成严重腐蚀,引起钢材的脆性断裂,以至发生重大事故。气田井口阀门是保证气田正常生产的关键设备,在气田开发初期,阀杆曾采用35 CrMo等低合金钢,使用中发生过严重的脆性断裂或表面严重腐蚀,致使丝扣锈死,最短的使用寿命仅十几天。也曾试验过用低合金钢表面渗铬工艺,但由于容易出现点蚀现
Our country Sichuan and other places have extremely rich natural gas resources, vigorously develop and utilize natural gas, and are of great significance to the development of our national economy and preparation for preparing people for people. Since natural gas in Sichuan gas field contains more hydrogen sulfide, it causes serious corrosion to equipment, causing brittle fracture of steel and causing serious accidents. Gas field wellhead valve is the key equipment to ensure the normal production of gas field. In the early stage of gas field development, the valve stem used low alloy steel such as 35 CrMo. Serious brittle fracture or serious surface corrosion occurred during use, causing the wire buckle to rust and the shortest use Life is only ten days. Have also tried to use low alloy steel surface chromizing process, but prone to pitting now