Technical Characteristics of Thick-walled Spiral Pipe in Production Process

1. Thick-walled spiral pipe forming process, the steel deformation even small residual stress, surface does not produce scratches. Processing of steel in the diameter and wall thickness of pipe sizes range, greater flexibility, especially in the production of high-grade steel thick-walled pipe, particularly large diameter thick-walled tube aspect has the incomparable advantage of other processes to meet more user requirements in terms of pipe specifications;

2. The use of internal and external welding (fine welding) process after the first pre-welding, can be implemented in the best position welding, less prone to the wrong side, partial and incomplete penetration welding defects, easy to control weld quality;

3. Overall mechanical expanding can effectively improve the dimensional accuracy of steel, and to improve the distribution of internal stress of the steel pipe, so as to avoid damage due to stress caused by corrosion, it is also conducive to the construction site welding;

4. Steel pipes need do the 9 items quality inspection with 100%, so that the whole process of steel production in the effective detection, monitoring under, effectively ensure the product quality SAW pipe.

Corrosion Insulation Performance of Spiral Steel Pipe

Anti-corrosion insulation pipe with corrosion resistance of steel, and has good insulation properties, has been widely used and promoted in building construction, and constantly improve and spread. Corrosion pipe insulation having different processing types and methods, different processing method to determine the pipe have different properties and functions, and the use range also changes. As the name suggests, it is to increase the number of external spiral steel pipe corrosion insulation class protection, in order to achieve low temperature can be used. In general, the use of second degree pipe insulation inorganic zinc-rich paint, which temperature ≥400 ℃, belonging to corrosion coating, conduit port is used polyethylene film called 3-layer PE or using cold sealing tapes to achieve the previously installed to prevent moisture entering into the water or construction.

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Spiral steel pipe insulation for high temperature, water and fuel pumps, chemical pump corrosive. Insulation pipeline centrifugal pump series products with low noise, performance, energy efficient and reliable. The insulation material used is a multi-layer bandaging wrong seam, so it is effective to reduce the heat loss, but also able to control the jacket surface measures to prevent the generation of cold bridges, so that the outer coating of temperature control is guaranteed. Spiral steel pipe wrapped with insulation material multilayer reflective layer of aluminum foil, which can effectively reduce the loss of heat, and can make the steam pipe can be more economical and reasonable. Anti-corrosion steel pipe insulation is a good corrosion resistance, along with good insulation properties, has been widely used and promoted in the design and construction, the current and constantly perfected and popularized. Spiral steel also have different types and methods of processing, while the different processing method to determine the pipe have different properties and functions, and range will change!

2016 New Year Speech by the Chairman of Shinestar

Dear partners, colleagues, and friends:

Good afternoon!

In the complicated international and domestic economic trend, Shinestar group with you hand in hand, steady steps over 2015, jingling and ushered in the 2016!
Over the past year, Shinestar group added several parts in the process of the development of the globalization strategy: Dubai, Sydney overseas department and Wuhan branch were set up; Nanchang, Tianjin two production base completed and put into operation; Group research and production platform has become increasingly mature and perfect. Today, Shinestar created 16 subsidiaries, as well as the global coverage, highly competitive sales trade network, has grown to the domestic level top steel pipe integrated supplier.

We have no intention to indulge the glory of our past, because, every step of our development is a small step for a goal to build "steel pipe integrated supplier in the field of benchmarking enterprise". Thanks for all of you to create today's achievements, and will promote Shinestar towards a brilliant future.
Finally, I wish everyone good health, work well, family happiness!

Let us work together, jointly build a good 2016!

Heat Treatment Process of LSAW Steel Pipe

First, reasonable selection. Straight pipe joints should choose a good micro deformable material straight seam steel pipe steel, for carbide segregation serious straight seam steel casting steel should be reasonable and transfer of heat treatment, larger and unable to cast a straight seam steel pipe steel may be solution bis refined heat treatment. Reasonable choice of heating temperature control heating rate, on a straight seam steel pipe can be heated slowly, preheat and other ways to reduce heating balanced straight seam steel pipe heat deformation.

Second, the correct heat treatment process operation and reasonable heat treatment process is also a useful way to reduce the distortion of straight pipe joints. Straight seam steel pipe deformation reason is often messy, but we only need to master the rules of the deformation analysis of the onset of the reason, the choice of avoiding abnormal deformation method of straight pipe joints can be reduced, and also can be controlled.

Third, straight seam steel pipe to be pre-heat treatment to eliminate the machining process of the remaining episodes of stress. For straight seam steel pipe, in the case of the conditions allow, try to use cryogenic vacuum heat treatment and quenching after quenching. In ensuring straight seam steel hardness of the premise, try to use pre-cooling, grading cooling quenching or austempering process.

Fourth, straight seam steel pipe planning portrayed to be reasonable, not too poor thickness, shape to symmetrical, straight pipe joints on large deformation deformed to master the rules, to reserve allowance, on a large, straight seam steel pipe can be used in combination plan. For some precision messy straight seam steel pipe can be used pre-heat treatment, aging heat treatment, quenching and nitriding heat treatment to control the accuracy of straight pipe joints. When the patch straight seam steel trachoma, porosity, wear and other defects, the choice of cold welding and other small heat-affected patch repair equipment, to prevent the onset of deformation process.

Precision steel tubes is a kind of seamless steel pipe.

Precision steel tubes is a kind of seamless steel pipe. Precision tubes features:

1. The cold-rolled precision steel tolerances and high precision, product precision control 卤 5mm, outer wall finish, the surface oxide layer.
2. The cold-rolled precision steel comprehensive performance excellent, able to withstand high pressure, cold bending, flaring, flattening no crack, no wrinkled skin, can do a variety of complex deformation and mechanical processing.
3. The promotion and application of precision seamless steel can save and improve processing effectiveness, reduce the manufacturing processes and equipment investment, can save costs and greatly reduce machining time, improve production and material utilization, and help to improve product quality, reduce cost.

Precision tubes uses: precision cold-rolled steel is widely used in automobiles, motorcycles, electric cars, petrochemical, power, shipbuilding, aerospace, areas of bearings, pneumatic components, the low-pressure boilers.
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Cause Analysis of LSAW Steel Pipe Surface Crack

Surface microcracks of lsaw steel pipe impact on product quality greatly, ranging from commuted, while in retirement, especially niobium, vanadium, titanium Longitudinal most prominent, has seriously affected the improvement of product quality and finished product rate. This not only gives the enterprise has brought huge economic losses, but also restricts the development of varieties of plate production line. Longitudinal surface microcracks mainly has edge crack, longitudinal, star cracks, its causes both improper rolling process parameter control, there are abnormal production of continuous casting process, the slab cracks genetic, residual element enrichment.

Longitudinal surface microcracks severely affect product quality. Longitudinal surface micro cracks main reason is the continuous casting mold copper coating off. This aspect will lead to copper penetration into the solidified shell austenite grain boundaries, grain boundary cracks; on the other hand will be uneven due to thermal stress cracks and crack sensitivity containing titanium steel strong performance is particularly evident . Control measures: To improve the quality of mold copper, copper to prevent dew; strengthen inspection before production of slab quality and production after Longitudinal; Longitudinal protection through good casting and other measures to improve Longitudinal steel cleanliness.

Pre-welding process for LSAW Steel Pipe

LSAW steel pipes (UOE, JCOE) manufacturing processes, welding processes are set to continuous advance. Its role is to be finalized after the tube forming, shaping and positioning within the weld seam on the back cover, in order to ensure the pipe dimensions and is conducive to tube welded pipe to improve quality and production efficiency.

Pre-welding process
After forming the tube by the next roller conveyor transported to a pre-welder's torch, rising rotating roll, rotate to adjust an open position to weld at the top of both sides of the pressure on the pressure roller and the pressure roller so that the tube seam, drop gun and adjust the tracking of the weld seam, open the protective gas and cooling water, start welding, welding condition monitoring, welded to the tube end welding arc stops (automatic delay stop gas), lift the gun and the top pressure rollers, pipe welder pre sent , pipe ends and welding defects.

Pre-welding process characteristics
Pre-welding using Ar + CO2 mixed gas shielded arc welding, continuous welding seam on the back of the tube to move at a faster speed. Since the bevel angle, tube shape, the tube along the longitudinal direction of the opening and both sides of the plate edge distortion factors of inequality, forming the seam after seam quality is not stable, larger changes. Need to change the tube seam welding, the arc of a steady state, the weld position deviated from the case and other real-time tracking and adjusted accordingly. Thus presoldered have welding speed, impact seam quality factors, changes and adjustments randomness and other characteristics.