An apparatus for combining steel tubes or pipes with plastic linings, comprising: a first arrangement for heat combining steel tubes or pipes with their plastic linings utilizing steam as heat source, wherein the first arrangement comprises a multifunctional combining chamber having one or two doors for allowing the steel tubes or pipes to enter or exit the multifunctional combining chamber wherein in case of two doors they are located at the same end or both ends or in the middle of the first arrangement; a steam circulation system adapted to continuously supply re-usable steam for heat combining the steel tubes or pipes with their plastic linings, said steam circulation system comprising means for re-heating the steam and means for supplementing the steam; and a device for cooling and shaping the steel tubes or pipes by means of water, gas or their combination; said apparatus further comprising a second arrangement for conveying the steel tubes or pipes into the multifunctional combining chamber by means of a multifunctional tube or pipe carriage; said apparatus further comprising an automatic controlling system, which comprises a detecting device, a displaying device, input means for inputting parameters including inflow speed, flow rate, time, temperature, pressure of the steam, and pressure of compressed air wherein the compresses air can be filled into the tubes or pipes to apply pressure inside the tubes or pipes; and said apparatus further comprising a controlling device comprising any one of the following: a temperature controller, a pressure controller, a gas valve controller, a steam valve controller, an a time difference controller; characterized in that said apparatus further comprises means for filing the tubes or pipes with steam such that pressure inside the tubes or pipes can be increased. a first arrangement for heat combining steel tubes or pipes with their plastic linings utilizing steam as heat source, wherein the first arrangement comprises a multifunctional combining chamber having one or two doors for allowing the steel tubes or pipes to enter or exit the multifunctional combining chamber wherein in case of two doors they are located at the same end or both ends or in the middle of the first arrangement; a steam circulation system adapted to continuously supply re-usable steam for heat combining the steel tubes or pipes with their plastic linings, said steam circulation system comprising means for re-heating the steam and means for supplementing the steam; and a device for cooling and shaping the steel tubes or pipes by means of water, gas or their combination; a multifunctional combining chamber having one or two doors for allowing the steel tubes or pipes to enter or exit the multifunctional combining chamber wherein in case of two doors they are located at the same end or both ends or in the middle of the first arrangement; a steam circulation system adapted to continuously supply re-usable steam for heat combining the steel tubes or pipes with their plastic linings, said steam circulation system comprising means for re-heating the steam and means for supplementing the steam; and a device for cooling and shaping the steel tubes or pipes by means of water, gas or their combination; said apparatus further comprising a second arrangement for conveying the steel tubes or pipes into the multifunctional combining chamber by means of a multifunctional tube or pipe carriage; said apparatus further comprising an automatic controlling system, which comprises a detecting device, a displaying device, input means for inputting parameters including inflow speed, flow rate, time, temperature, pressure of the steam, and pressure of compressed air wherein the compresses air can be filled into the tubes or pipes to apply pressure inside the tubes or pipes; and said apparatus further comprising a controlling device comprising any one of the following: a temperature controller, a pressure controller, a gas valve controller, a steam valve controller, an a time difference controller;