冷拔精密钢管.doc

聊城市江汉管材有限公司 冷拔精密钢管一、冷拔精密钢管概述（最常采用GB/T3639标准）1、 定义：冷拔精密钢管通常在0.5100T的单链式或双链式冷拔机上进行。若欲获得尺寸更小和质量更好的无缝钢管，必须采用冷轧、冷拔或者两者联合的方法。2、制钢要求：冷拨精密钢管，主要用10、20号钢制造，除保证化学成分和机械性能外，还要做水压试验，卷边、扩口、压扁等试验。3、冷拔精密钢管的生产工艺及示意图冷拔精密钢管的基本工序有：(1)管料供给，所用管料为热轧成品管或半成品管、挤压管以及焊接管；(2)管料准备，包括检查、打捆、酸洗、清洗、冲洗、中和、烘干、涂润滑剂等；(3)冷加工(冷轧或冷拔)；(4)成品精整包括成品热处理、矫直、取样、切头尾、检查(人工检查和各种探伤)、水压试验、涂油、包装、入库等。不同的产品精整内容有所差异。冷拔精密钢管生产工艺简易流程是：圆管坯加热穿孔打头退火酸洗涂油（镀铜）多道次冷拔（冷轧）坯管热处理矫直水压试验（探伤）标记入库。冷拔精密钢管厂生产特点是管料从投入到加工成成品冷拔精密钢管通常要经过多次冷变形并产生加工硬化，因而整个生产过程由多个准备工序和变形工序组成，且具有往复循环的特点，因而工序多，生产周期长、金属消耗较大，生产效率较低，一般生产规模均不大。冷拔精密钢管的生产工艺流程如图。二、冷拔精密钢管的特点1.外径更小。2.精度高可做小批量生产。3.冷拔成品精度高，表面质量好。4.钢管横面积更复杂。5.钢管性能更优越，金属比较密。三、冷拔精密钢管的化学成分、力学性能、尺寸允许偏差1、化学成分碳 C ：0.100.15硅 Si：0.170.37锰 Mn：1.101.60硫 S ：0.035磷 P ：0.035铬 Cr：0.901.30钒 V ：0.030.06钼 Mo：0.320.40硼 B ：0.0020.0062、力学性能精密无缝钢管力学性能钢种力学性能冷拔(轧)管金切管20#抗拉强度bN/mm2伸长率5%51039052045#64759044加工形式缸径长度直线度尺寸精度内孔粗糙度冷轧30-10012M0.3-1.0H8-H100.4-1.6冷拔30-25012MH8-H100.8-1.6珩磨40-50012M1000H8-H90.4-0.8滚压40-4007MH80.43、 尺寸允许偏差按GB/T3639冷拔精密无缝钢管的标准：外径4-30的公差为0.08尺寸公差(壁厚偏差5%)内径尺寸H8H9H1030+0.0330+0.0520+0.084030-50+0.0390+0.0620+0.100050-80+0.0460+0.0740+0.120080-120+0.0540+0.0870+0.1400120-180+0.0630+0.1000+0.1600180-250+0.0720+0.1150+0.1850250-315+0.0810+0.1300+0.2100315-400+0.0890+0.1400+0.2300四、冷拔精密钢管的用途是用于机械结构、液压设备的尺寸精度高和表面光洁度好的冷拔精密钢管。选用精密无缝管制造机械结构或液压设备等，可以大大节约机械加工工时，提高材料利用率，同时有利于提高产品质量。五、冷拔精密钢管的规格表规格规格规格规格规格规格规格规格规格规格规格规格40.5160.5261.8359.0485.0702.8101.8204.0304.5421.5601.0804.040.8160.8262.03510485.5703.0102.0204.5305.0421.8601.2804.541.0161.0262.2380.5486.0703.5102.2205.0305.5422.0601.5805.041.2161.2262.5380.8487.0704.0102.5205.5306.0422.2601.8805.550.5161.5262.8381.0488.0704.5102.8206.0307.0422.5602.0806.050.8161.8263.0381.2489.0705.0103.0207.0308.0422.8602.2807.051.0162.0263.5381.54810705.5120.5220.5309.0423.0602.5808.051.2162.2264.0381.8501.0706.0120.8220.83010423.5602.8809.060.5162.5264.5382.0501.2707.0121.0221.0320.5424.0603.0801060.8162.8265.0382.2501.5708.0121.2221.2320.8424.5603.5801261.0163.0265.5382.5501.8709.0121.5221.5321.0425.0604.0801461.2163.5266.0382.8502.07010121.8221.8321.2425.5604.5801661.5164.0267.0383.0502.27012122.0222.0321.5426.0605.0851.561.8164.5268.0383.5502.57014122.2222.2321.8427.0605.5851.862.0165.0280.5384.0502.8751.0122.5222.5322.0428.0606.0852.070.5165.5280.8384.5503.0751.2122.8222.8322.2429.0607.0852.270.8166.0281.0385.0503.5751.5123.0223.0322.54210608.0852.571.0180.5281.2385.5504.0751.8123.5223.5322.8451.0609.0852.871.2180.8281.5386.0504.5752.0124.0224.0323.0451.26010853.071.5181.0281.8387.0505.0752.2140.5224.5323.5451.56012853.571.8181.2282.0388.0505.5752.5140.8225.0324.0451.8651.0854.072.0181.5282.2389.0506.0752.8141.0225.5324.5452.0651.2854.580.5181.8282.53810507.0753.0141.2226.0325.0452.2651.5855.080.8182.0282.8400.5508.0753.5141.5227.0325.5452.5651.8855.581.0182.2283.0400.8509.0754.0141.8250.5326.0452.8652.0856.081.2182.5283.5401.05010754.5142.0250.8327.0453.0652.2857.081.5182.8284.0401.2551.0755.0142.2251.0328.0453.5652.5858.081.8183.0284.5401.5551.2755.5142.5251.2329.0454.0652.8859.082.0183.5285.0401.8551.5756.0142.8251.53210454.5653.0851082.2184.0285.5402.0551.8757.0143.0251.8350.5455.0653.5851282.5184.5286.0402.2552.0758.0143.5252.0350.8455.5654.0851490.5185.0287.0402.5552.2759.0144.0252.2351.0456.0654.5851690.8185.5288.0402.8552.57510144.5252.5351.2457.0655.0901.591.0186.0300.5403.0552.87512150.5252.8351.5458.0655.5901.891.2200.5300.8403.5553.07514150.8253.0351.8459.0656.0902.091.5200.8301.0404.0553.57516151.0253.5352.04510657.0902.291.8201.0301.2404.5554.0801.0151.2254.0352.2481.0658.0902.592.0201.2301.5405.0554.5801.2151.5254.5352.5481.2659.0902.892.2201.5301.8405.5555.0801.5151.8255.0352.8481.56510903.0引