本周中南地区方管市场价格震荡调整，天津唐山邯郸主要管厂统计：本周(5.9)厂内原料带钢库存36.75万吨；焊管库存8.85万吨；方管库存21万吨；日均成交量4.86万 吨。另兰格网本周钢坯库存调查：据统计9日唐山主要仓库钢坯库存约30.91万吨，较节前(30日)35.35万吨降4.44万吨，降幅12.56%，降 库放缓，但原料价格支撑依然强劲。市场方面，本周钢坯价格高位震荡，在限产供应减量预期下，市场下跌空间有限。本周管厂焊镀管产量相比节前有小幅下降，不过后期市场供给压力依然较 大。进入五月份商家面对不确定因素操作多以快进快出为主，另端需求逐渐萎缩，社会库存降速放缓，商家让利促成交意愿增强。尽管钢厂挺价意愿强，但市场走势 不佳，中南部分地区倒挂情况逐渐加重。预计本周中南地区方管价格或承压下行。
This week, the price of square pipe market in central and southern China has been shaken and adjusted. Statistics of Tianjin Tangshan Handan main pipe factory show that this week (5.9) the stock of raw material strip steel is 367,500 tons; that of welded pipe is 88,500 tons; that of square pipe is 210,000 tons; and that of daily average turnover is 48,600 tons. According to statistics, the stock of billets in Tangshan's main warehouse was about 309.1 million tons on the 9th, down 44.4 million tons, or 12.56%, from 353.5 million tons on the 30th day before the festival. The stock reduction slowed down, but the price support of raw materials remained strong. On the market side, this week's high billet price shocks, in the expected reduction in production and supply, the market has limited room for decline. This week, the production of welded and plated pipes in the pipe factory decreased slightly compared with that before the festival, but the supply pressure in the later period of the market is still greater. In May, when faced with uncertainties, businesses mostly operate fast-in and fast-out. Demand on the other end is gradually shrinking. The decline of social inventory is slowing down. Businessmen'willingness to make profits is increasing. Despite the strong willingness of steel mills to bid, but the market trend is not good, the situation of upside-down in the central and southern parts of the region is gradually aggravated. It is expected that the price of welded and plated pipes in central and southern China will go down next week. 价格方面：现郑州本地4寸(3.75)方管 均价4900元(过磅价，下同)，与上周持平；武汉4寸(3.75mm)方管均价为5040元，较上周涨40元；长沙4寸(3.75mm)方管均价 5010元，与上周持平；广州4寸(3.75mm)方管均价为5653元，较上周涨30元；南宁4寸(3.75mm)方管均价为5014元，与上周持 平；海口4寸(3.75mm)方管均价为5587元，与上周持平。
Price: Zhengzhou local 4-inch (3.75 mm) square tube average price 4900 yuan (pound price, the same below), and last week is the same; Wuhan 4-inch (3.75 mm) square tube average price is 5040 yuan, 40 yuan higher than last week; Changsha 4-inch (3.75 mm) square tube average price 5010 yuan, the same as last week; Guangzhou 4-inch (3.75 mm) square tube average price is 5653 yuan, 30 yuan higher than last week; Nanning 4-inch (3.75 mm) square tube average price is 5014 yuan, the same as last week; The average price of Haikou 4-inch (3.75 mm) square tube is 5,587 yuan, which is the same as last week.
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… 天津方管基本持稳的同时弱势运行出货量低位…方管本周天津方管市场涨跌两难。周内，本地天钢产热轧管坯价格和山东中小管厂出厂价平稳运行，受此影响，本地方管价 格调整的幅度并不大，仅仅窄幅波动。从市场了解到，临近年底多数终端方管厂家已无新增采购计划，因此市场上主流方管厂家日出货量低位平稳，保持在二、三吨到七、 八吨的水平，由于终端需求持续低迷、本地热轧管坯…
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