焊接方管与无缝方管的本质差别在哪里？方管无缝方管是由无缝钢管冷拔挤压成型的方型钢管，并非直出的焊接方管，而焊接方管也称焊管，是用钢板或带钢经过卷曲成型后焊接制成的方管。焊接方管生产工艺简单，生产效率高，品种规格多，设备资少， 常用材质为：Q235A，Q235C。Seamless square pipe is a square pipe formed by cold-drawing and extrusion …

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.

郑州镀锌方管市场价格小幅下降库存增加明显…方管本周郑州镀锌方管市场价格小幅下降，距离农历新年已经越来越近，本地的工地开始陆续进入停工状态，对于方管的需求量开始下降，方管库存量开始回升。上半周市场价格降幅较大，虽成本端坚挺，但年关逼近且下游陆续放假，受需求拖累，焊管、镀锌方管涨势后劲不足。预计下周本地镀锌方管市场价格窄幅震荡。方管市场方面，鉴于方管… 成都市场镀锌方管价格或弱稳运行厂家成交一…方管今日成都镀锌方管市场价格持稳运行。本地市场：据了解，今日市场持稳运行，成交一般。下游采购意愿一般，需求释放进度缓慢，另外房地产方面由于资金的回转，导致下游资金面再收紧，进而影响需 求释放。消息面：据国家统计局数据显示，2020年9月份，我国钢筋产量2342.2万吨，同比增长9.9%；1-9月，我国钢筋产量19504.1万 吨，…