国内方管市场价格将窄幅波动为主厂家有排产…方管方管市场价格均下调，方管厂家已经全面复工，而近期价格波动较大，涨涨跌跌让整体心态谨慎心态加重，市场方面仍有方管厂家在家办公为主，供需仍然 没有平衡，统计唐山方管方管厂家出货情况唐23家方管厂，多数方管厂家以复工，未复工共6家，车辆运输较通畅，最远可送达至山东地区，近期部分方管厂家有排产计划…

南京市场方管价格下跌，成交一般。早盘螺纹钢期货低开低走。唐山方坯跌20元，现普碳方坯含税出厂3510元。从当地贸易商了解， 贸易战对市场心态影响较大，除刚需低价有所成交，大多仍处在观望。商家进少出多，以完成销售任务为主。钢厂库存尚无压力，不过价格下调较之前有所放大。综 上所述，预计明日南京市场或继续回落。

In Nanjing market, prices fell and transactions were normal. Early-trading threaded steel futures open low. Tangshan billet fell 20 yuan, and now ordinary carbon billet with tax is 3510 yuan out of the factory. From the local traders, the trade war has a great impact on the market mentality. Most of them are still on the sidelines, except for the bargain just needed at a low price. Businessmen come in less and go out more, mainly to complete sales tasks. There is no pressure on steel mill stocks, but the price reduction has been enlarged. In summary, the Nanjing market is expected to continue to decline tomorrow. 价格方面：截止发稿时，永钢、沙钢三级大螺纹4210元(吨价，下同)，跌50元。

Price: Up to the time of submission, Yonggang and Shagang three-level large threads 4210 yuan (ton price, the same below), down 50 yuan.

贵阳镀锌方管价格或将以稳为主盘整运行厂家…方管贵阳市场镀锌方管价格小幅上涨。今天唐山方坯延续涨势，累涨20元。同时期螺早盘高位运行。方管厂家开市后普遍小幅拉涨价格，但下游用户观望氛围浓厚，市场整体交投情况一般。午后，部分方管厂家 暗降价格，以出货为主；另外，也有部分方管厂家对后市看好，认为价格仍有上涨空间，所以挺价意愿强烈。库存方面，目前市场镀锌方… 分析方管表面缺陷的五种检测方法方管方管表面缺陷的检测方法，主要有以下五种：一电涡流检测.电涡流检测有多种形式，常用的有常规涡流检测、远场涡流检测、多频涡流检测和脉冲涡流检测等，利用电涡流传感器对金属进行感应，方管表面不同缺陷类型和形状将产生不同类型的信号。其优点是检测精度高、探测灵敏度高，检测速度快，能检测待检测管材的表面及亚表面，且…