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What problems should be paid attention to when welding 16Mn seamless steel pipes?

What problems should be paid attention to when welding 16Mn seamless steel pipes?

Date : 2021-03-01

 The process of 16Mn seamless steel pipe processing is a more important step, and in many cases it is a series of complete steps. Because 16Mn seamless steel pipe is a useful type of steel, there are many production technologies that we need to master. One of the more important technologies is welding, because electric welding is indeed a difficult technical activity. It is generally necessary to pay attention to the relevant technology when it is time. The relevant technology and steps are stipulated as follows. We write it down for your reference only:

(1) Check whether the water, electricity, and gas are connected, and connect them as required, and they cannot be loosened. Water, electricity, and gas are all dangerous factors in the welding process of special-shaped pipes, so they must be checked before welding.

(2) Use related tools to clean the profile of the base material, that is, use a brush or sandpaper to completely cut the base material profile water, oil, oxides and other impurities to ensure the quality of welding.

(3) Pay attention to the cleaning of 16Mn seamless steel pipe welding work place, and avoid flammable and explosive materials, and adopt wind shelter methods.

(4) Really check whether the wiring of the welding machine meets the requirements. The quality of the wire is the most likely to cause chaos, so it must not be taken lightly.

(5) The pre-welding inspection of the 16Mn seamless steel pipe base metal is necessary because it is directly related to the welding result.

(6)The main welding layout should be cleaned by chemical cleaning. It can simply use acetone or caustic soda sulfuric acid to clean water, oil, high melting point oxide film, oxides and other contaminants.

Tips:The ASTM A500 specification covers cold-formed welded and seamless carbon steel tubing in round, square, rectangular, and “special” shapes for welded, riveted, or bolted construction applications, as well as for general structural purposes.
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Steel production restrictions in the Chinese market are becoming more stringent

Steel production restrictions in the Chinese market are becoming more stringent

Date : 2021-03-26

The editor of Nansteel Manufacturing Co.,Ltd has compiled recent news related to China\'s steel market

On March 24, the prices of black bulk commodity futures rose strongly, and the price trend turned from weak to strong. At midday, affected by rumors of production restrictions in Jiangsu and Zhejiang, the futures market suddenly exerted strength and continued to rise. Iron ore and rebar futures rose sharply. The price of iron ore futures rose by 2.78%, and the main contract price of rebar rose above the 4800 mark.

Spot: On the 24th, the spot price of steel products was boosted by the sharp rise in steel futures prices. The decline in steel prices in most areas slowed down, and some areas rebounded. Some steel mills slightly lowered their ex-factory prices. Affected by the national environmental protection inspection teams investigation in Xuzhou, the steel market was worried about large-scale production restrictions in the later period. The futures market took the lead. Tangshan steel billet rose by 40 yuan/ton. Downstream users actively purchased, steel traders raised prices for shipments, and market speculation. Demand increased, some merchants were closed for sale, and the overall transaction was good.

On March 24, domestic construction steel prices rose and fell mixed; among them, Hangzhou Zhongtian reported 4,730 yuan/ton, up 30 yuan/ton; Beijing Hegang reported 4,620 yuan/ton, down 10 yuan/ton; Guangzhou Guanggang reported 4800 yuan /Ton, down 30 yuan/ton. The domestic hot-rolled coil price partly increased by 30 yuan/ton; among them, Shanghai Benxi Iron and Steel reported 5100 yuan/ton, up 30 yuan/ton; Tangshan Anfeng reported 5,000 yuan/ton, stable; Foshan Liugang reported 5120 yuan/ton, up 20 yuan/ton. The domestic medium and heavy plate prices partially fell 30 yuan/ton; Jiangyin Hengrun reported 5140 yuan/ton, which was stable; the domestic cold rolled coil prices partially fell 30 yuan/ton, of which Shanghai Bengang reported 5650 yuan/ton, down 20 yuan /Ton.

Surprisingly, Nansteel Manufacturing Co.,Ltd\'s seamless steel pipes(astm a500 tubing), spiral steel pipes and other products have maintained strong exports.

Raw materials: On March 24, the ex-factory price of steel billets rose slightly. The common carbon billet resources in Changli area increased by 40 yuan/ton, 4,600 yuan/ton including tax, and the common carbon billet resources of steel mills in Qian\'an area increased by 40 yuan/ton. , Report 4640 yuan/ton including tax. Spot billet resources may be tight in April, which will provide strong support for billet prices. It is expected that the billet market will continue to fluctuate strongly in the short term.

The iron ore spot market as a whole did not experience major fluctuations, the market sentiment was tepid, and the transaction situation was average. The steel mills still focused on on-demand purchases. Traders have not yet seen the phenomenon of dumping goods. The short-term iron ore market has fluctuated and adjusted.

The scrap steel market continues to operate in a weak state, and the production restriction measures in Hebei continue to ferment. Most of the local steel companies in Tangshan either stop collecting scrap resources or lower their purchase prices significantly. Only Yanshan Iron and Steel has increased prices to absorb goods, but the overall trend is Still showing a downturn, there are market rumors that steel companies in Jiangsu and Zhejiang are also facing the risk of restricting production.

Macro: In mid-March, the social inventory of five major types of steel in 20 cities was 17.28 million tons, a month-on-month decrease of 490,000 tons, a decrease of 2.8%, the first month-on-month decline this year; an increase of 9.98 million tons from the beginning of the year, an increase of 136.7%; compared with the same period last year Reduced 2.72 million tons, down 13.6%.

According to preliminary data released by the World Steel Association recently, in February 2021, the crude steel output of the 64 countries included in the World Steel Associations statistics was 150 million tons, an increase of 4.1% year-on-year. The top ten crude steel producers in the world in February were China, India, Japan, the United States, Russia, South Korea, Turkey, Germany, Brazil and Iran.

The Ministry of Industry and Information Technology will formulate more stringent implementation measures for capacity replacement in the iron and steel industry this year, improve the capacity information early warning release mechanism, implement dual control of capacity and output, organize the implementation of iron and steel decapacity, look back, and gradually study and establish a total of carbon emissions, pollutant emissions, and energy consumption. The output constraint mechanism based on the quantity, etc. At present, my country\'s steel industry has the largest carbon emissions among the 31 manufacturing sectors, and crude steel production accounts for more than half of the global crude steel production.

Forecast: According to the latest data from the China Iron and Steel Association, due to the impact of production restrictions, the average daily crude steel output of key steel companies in mid-March has declined for two consecutive days, and has now fallen to a one-month low. Expectations from the supply side of steel are still expected. At present, under the background of favorable domestic macro and industrial policies, Tangshan and other places have strictly implemented production restrictions, and the time path for carbon peaks is gradually clear. In the short term, steel prices may still rise, but it is necessary to pay close attention to whether downstream steel demand can increase.

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Reasons for the recent rise in the price of seamless steel pipes

Reasons for the recent rise in the price of seamless steel pipes

Date : 2021-04-02

Chinese seamless linepipe prices have jumped by $120 per tonne over the past month because of rising costs. With iron ore prices remaining elevated, scrap costs on the rise, and activity at steel mills curbed by environmental measures, steel billet has become difficult to source, bolstering the prices for seamless linepipe.

This increase was mirrored by import prices in the Middle East, largely because of offers from Chinese mills going up, but the market was on the rise even for suppliers in other regions.

In contrast, Chinas prices for seamless oil country tubular goods (OCTG) have remained stable amid weak demand. And with prices being driven by costs, we believe that a downward trend for iron ore will allow Chinese prices to moderate in the second quarter of 2021.

Steel continues to support US prices

Seamless OCTG and linepipe prices in the United States held steady at the start of March, with seamless mills having the relative advantage over producers of similar electric resistance welded (ERW) materials due to the surge in steel substrate costs for welded alternatives.

The number of transactions remained modest, however, with operators and distributors buying only what is needed in the short term, given the high prices and the slow resumption of demand.

But strong steel prices will continue to support the seamless market into the second quarter, leaving seamless prices to peak in the third quarter. Even after that peak in pricing, we expect only modest price declines because pipe market fundamentals normally strengthen late in the year and provide price support.

EU margins reach bottom

With a global recovery in sight, we believe that European pipe producers are determined to pass along any further cost increases to buyers. For linepipe in particular, mills are already selling May production and seem to have found their footing.

Higher inventories weigh on the OCTG market, where it is possible to purchase from distributors at prices well below those for new-rolling material.

Source: Seamless Steel Pipe Supplier

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