30min. During the period, temperature of all measuring points shall be within the specified range and the difference can’t be larger than 50℃. 1 For non-alloy steel, 2min~2.5min/mm; 2 For alloy steel, 3min/mm. c Cooling rate after constant time shall be carried out with formula 6500/δ℃/h and not larger than 260℃/h. When temperature drops to 300℃, the pipeline can’ be cooled by radiation. Notes: δ is wall thickness of pipe, mm. 7.4.10　异种钢焊接接头的焊后热处置，应按SH 3526的规则进行。 7.4.10 Heat treatment of weld joints of special steel shall meet SH 3526. 7.4.11　焊后需求进行消除应力热处置的管

段，可选用全体热处置的办法，但该管段上不得带有焊接阀门。 7.4.11 Integral heat treatment of pipeline after welding may be carried out for relieving of stress. The pipeline shall have no welded valve. 7.4.12　现已进行焊后热处置的管道上，应防止直接焊接非受压件，假如不能防止，若同时满足下列条件，焊后可不再进行热处置： 　　a 管道为非合金钢或碳锰钢资料； 　　b 角焊缝的核算厚度不大于10 mm； 　　c 按鉴定合格的焊接技能施焊； 　　d 角焊缝进行100%外表无损检测。 7.4.12 Unpressurized elements can’t be directly welded on pipeline after heating treatment. If it is unavoidable, heat treatment can be omitted after welding if following conditions are met: a The pipeline is made of non-alloy steel or carbon magnetic steel. b Calculated thickness of fillet weld is not larger than 10mm. c Qualified welding procedure is adopted. d Nondestructive test is carried out for surface of 10% of fillet welds. 7.4.13　经焊后热处置合格的部位，不得再从事焊接作业，否则应从头进行热处置。 7.4.13 After heat treatment, welding can’t be carried out on qualified part. Otherwise, heat treatment shall be carried out again. 7.5　质量查验Quality inspection 7.5.1　查验焊接接头前，应按查验办法的需求，对焊接接头的外表进行相应处置。 7.5.1 Surface of weld joints shall be treated according to the requirement before inspection of weld joints. 7.5.2　焊缝外观应成型杰出，宽度以每边盖过坡口边际2mm为宜。角焊缝的焊脚高度应契合规划文件规则，外形应平缓过渡。 7.5.2    Appearance of weld joints shall be satisfactory. Both edges of weld joint shall cover 2mm width of two edges of groove. Height of leg shall meet the design document. The surface shall be smooth 7.5.3　焊接接头外表的质量应契合下列需求： 　　a 不得有裂纹、未熔合、气孔、夹渣、飞溅存在； 　　b规划温度低于-29℃的管道、不锈钢和淬硬倾向较大的合金钢管道焊缝外表，不得有咬边表象；其他原料管道焊缝咬边深度不该大于0.5mm，接连咬边长度不该大于100mm，且焊缝两边咬边总长不大于该焊缝全长的10%； 　　c 焊缝外表不得低于管道外表，焊缝余高Δh应契合下列需求： 1 100%射线检测焊接接头，其Δh≤1+0.2b1，且不大于2mm； 2 其他的焊接接头，Δh≤1+0.2b1，且不大于3mm。 　　　 注：b1为焊接

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