分析方管表面缺陷的五种检测方法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…

石家庄方管和镀锌方管市场价格暂稳。原料方面，今日唐山瑞丰355mm系列带钢价下跌30元，主流管厂出厂价格下调10-20元。今日石家庄焊镀管市场价格暂稳，市场整体成交欠佳。 据当地贸易商反馈，近期上游原材料市场价格下跌趋势明显，但市场成交疲软，商家对后市行情多抱观望态度。库存方面持续保持低位水平运行。整体来看，预计短 期内石家庄镀锌方管市场将以震荡偏弱运行为主。

Shijiazhuang square pipe and galvanized square pipe market prices temporarily stable. In terms of raw materials, the price of Tangshan Ruifeng 355mm series strip steel fell by 30 yuan today, while the ex-factory price of mainstream pipe factory decreased by 10-20 yuan. Today, Shijiazhuang welding and plating pipe market prices are temporarily stable, the overall market turnover is not good. According to the feedback from local traders, the price of raw materials in the upstream market has declined obviously in recent years, but the market turnover is weak, and the merchants hold a wait-and-see attitude towards the future market. Inventory continues to operate at a low level. Overall, it is expected that the galvanized square pipe market in Shijiazhuang will be dominated by weak oscillation in the near future.

方管价格方面，现唐山京华产4寸(3.75mm)方管价格4090元，天虹(正大)产4 寸(3.75mm)方管价格4080元。镀锌方管：友发产4寸(3.75mm)镀锌方管价格4790元，正金元产4寸(3.75mm)镀锌方管价格4730元， 天虹(正大)产4寸(3.75mm)镀锌方管价格4720元。以上价格均与上个交易日持平。

In terms of square tube price, the present price of 4 inches (3.75mm) square tube in Jinghua, Tangshan and 4 inches (3.75mm) square tube in Tianhong (Zhengda) are 4090 yuan and 4080 yuan respectively. Galvanized square pipe: Youfa 4 inch (3.75 mm) galvanized square pipe price 4790 yuan, Zhengjin 4 inch (3.75 mm) galvanized square pipe price 4730 yuan, Tianhong (Zhengda) 4 inch (3.75 mm) galvanized square pipe price 4720 yuan. The above prices are all the same as on the previous trading day. 

　　天津方管市场价格仍将维持震荡偏弱运行本周方管行情回顾：周初开市期螺保持高位震荡走势，但现货市场并不配合，终端 用户心态较为谨慎维持按需采购，中间商实际成交中亦以优惠让利出货为主。此后，期螺一路震荡下行，市场观望情绪浓厚，同时近期连续大雾天…