Technical Requirement of Galvanized Steel Pipe

Technical Requirement of Galvanized Steel Pipe

1, grades and chemical composition

Galvanized steel grades and chemical composition should be consistent with GB 3091 under the black tube steel grades and chemical composition.

2, the manufacturing method

The manufacturing method of the black tube (furnace welding or welding) is selected by the manufacturer. Galvanized by hot-dip galvanizing method.

3, thread and pipe joints

3.1 galvanized steel pipe with threaded delivery, the thread should be in galvanized after the car system. Threads shall comply with YB 822.

3.2 steel pipe joints should be consistent with the provisions of YB 238; malleable iron pipe fittings should be consistent with YB 230 requirements.

4, mechanical properties of galvanized steel pipe before the mechanical properties should be consistent with the provisions of GB 3091.

5, uniformity of galvanized galvanized steel pipe galvanized layer should be uniformity of the test. Steel pipe samples in copper sulfate solution for 5 consecutive impregnation shall not be red (copper color).

6, cold bending test Nominal diameter of not more than 50mm galvanized steel pipe should be cold bending test. Bending angle of 90 °, bending radius of 8 times the diameter. Test with no filler, the specimen weld should be placed in the bending direction of the outer or upper. After the test, the sample should not have cracks and zinc peeling off the same.

7, water pressure test Water pressure test should be carried out in the black, eddy current testing can also be used instead of water pressure test. Test pressure or eddy current inspection shall be in accordance with GB 3092 for the size of the reference sample.

Spiral steel pipe, straight seam steel pipe, steel springboard be better progressly

Spiral steel pipe, straight seam steel pipe, steel springboard be better progressly
The situation of the steel market this year is different from previous, traditional demand off-season arrival did not cause too big effect, because of the influence of the low costs and inventory, steel price short-term downside is limited, can predict early November steel prices fly again for a while! As a result, the spiral steel pipe, straight seam steel pipe, steel springboard products prices are going.
Steel market supply and demand in November there was still hope keep good posture, basically have the following reasons:
1, the capacity factor
Recent provinces to work in production on the agenda, on October 29, held in tangshan dissolve excess steel production capacity in October on demolishing, finished the province up to dissolve the steel production tasks this year. Operation, were dismantled the plump, qianan 8 companies nine four of converter or blast furnace burden, dissolve the ironmaking production capacity 4.83 million tons of steel production capacity of 2.9 million tons. Released parts factory shut down after the blast furnace, and the overall out of billet quantity reduced, already in short supply of billet is more short, cause certain influence to the stock.
2, inventory factors
In early October steel inventory and social inventory has fallen sharply, stock fell 113.3 and 902000 tons respectively, to the end of the month continues to decline, infinite close to historic lows. Look from the supply, according to the latest statistics, 164 tangshan steel blast furnace capacity utilization is 76.83%, weeks than fell by 4.88%, with the capacity to further fall to the ground, the development of the environmental supervision, the steel mills cut production maintenance, strained November will exacerbate, balance between supply and demand will be phased order.
3, cost factors,
Considering the steel mills coal, coke available inventory days continues to decline, some even only enough to use two or three days, the supply is still tight, there is a slight upward space; in November Catch up market also appears under its impetus, iron ore imports ore in October index gained about $10 / ton, this will encourage steel costs continue to rise. According to ChengShi of iron and steel group, data statistics, as of November 1, the average profit level of the thread is about 70 yuan/ton, profile is still losing money, the average losses of 30 yuan/tons, in social inventory and steel inventories are not high, steel sales, pressure is not big, the high cost can support steel prices continue to strong.
4, macro stabilizing factor
Obvious signs of macroeconomic stabilisation, demand for steel has had a huge impact. September PPI rebounded 0.5%, rose 0.1%, ended 54 months continue to fall. Due to higher commodity prices, laid the foundation for the expansion of enterprise management and earnings upgrades. Three is the enterprise profit improvement. Industrial enterprises above designated size 9 month before total profit year-on-year growth of 8.4%, 2.2% faster than the first half, 7-15.2% growth in August, September state profit up 27% from a year earlier. Corporate earnings improve, provides the power source for promoting investment. Both investment stabilized, and improve corporate profits, were supportive of steel consumption.
To sum up, the steel market in November, the cost and the influence of low inventory, downward space is limited, but, after all, the off-season fell to demand will continue to fall, the extent of upward will also be limited. Taken together, the probability of strong operation is higher, spiral steel pipe, straight seam steel pipe, steel springboard product prices will still be better progressly.

Galvanized Steel Pipe Using Advantages

Galvanized Steel Pipe Using Advantages

When we talk about the galvanized steel pipes, we usually refer to the hot dipped galvanized steels pipes which are more durable and strengthened than any other types. The cleaning process which the hot dipped galvanized steel pipe uses is far more special in the combination use of the solutions, including the ammonium chloride, zinc chloride or the mixed solutions of both. And it will be sent into the hot dipped groove afterwards. The galvanized steel tube will be with more even layer of the galvanization and the capacity of cohesion, anti-corrosion and anti-dust. All of these as mentioned above will contribute to this kind of steel pipe to be have longer longevity than any other steel pipe kinds.

The regular specification of the galvanized steel tubing which are available from SHINESTAR include 48.3×2.5、48.3×2.75、48.3×3.0、48.3×3.25、48.3×3.5 and other customized types per required.
To maintain these galvanized steel tubes, we should keep in mind about these following steps:
1. Regular clean away the piling-up materials around the steel and control its loading under its limitation.
2. Regular observe if there is any deviation among the steel tube's whole structure of parts of it. If yes, make alteration in time.