博文

The Difference between Hot Rolling and Cold Rolling of Spiral Pipe

图片
There are differences in the implementation of hot rolling and cold rolling of   spiral pipes . Both processes are used to form steel sections or plates and have a significant impact on the structure and properties of the steel. Typically, the rolling of steel is dominated by hot rolling, while cold rolling is mainly used for the production of fine-type sections and thin plates. During hot rolling, the casting organisation of the ingot can be destroyed, grain refinement can take place and microstructural defects can be eliminated, resulting in a dense steel structure and improved mechanical properties. This improvement is mainly reflected in the direction along the rolling direction, making the steel to a certain extent non-isotropic; at the same time, under high temperature and pressure, the casting of bubbles, cracks and loose parts can be welded together. Cold rolling is at room temperature, through cold drawing, cold bending, cold drawing and other cold processing of steel plat...
发表评论
阅读全文

Differences Between Submerged Arc Welded and High-Frequency Straight Seam Welded Steel Pipe

图片
The welding process of   submerged arc LSAW steel pipe   is to connect the welding wire and steel plate by filling the weld to achieve the welding of LSAW steel pipe, while high frequency LSAW steel pipe uses the skin effect of high frequency current to melt the edge of the weld of the steel plate quickly, so that the weld will be fused together under the pressure of the external force, and the welding will be achieved. In terms of moulding, double-sided submerged arc LSAW steel pipe adopts JCOE moulding, which is cold-formed by stamping the steel plate one by one through the press, while high-frequency LSAW steel pipe adopts the moulding process in which the FXH multi-rolls are gradually turned into round shapes. In addition, there are obvious differences between submerged arc LSA steel pipe and HF LSA steel pipe in terms of production range, materials used, industries used and appearance. The production range of submerged arc steel pipe is from 325mm to 1420mm in diameter, a...
发表评论
阅读全文

The Ellipticity and Bending of Straight Seam Steel Pipe

图片
In the cross-section of   straight seam steel pipes , there may be inconsistencies in the outer diameter, where the maximum and minimum outer diameters are not necessarily perpendicular. Ellipticity (or out-of-roundness) is defined as the difference between the maximum and minimum outer diameters. To control ellipticity, some steel pipe standards specify that ellipticity should not exceed 80% of the outer diameter tolerance. straight seam steel pipes exhibit curvature in the lengthwise direction, with the degree of curvature expressed in terms of bending. The standard specifications for bending generally fall into two categories: 1. **Local Bending**: Local bending is determined by measuring the chord height (in mm) at the point of maximum curvature using a one-meter long straight edge, with bending expressed in units of mm/m, for example, 2.5mm/m. This method is also applicable for determining bending at the pipe ends. 2. **Total Bending Along the Entire Length**: Total bending is...
发表评论
阅读全文

Key Equipment in Seamless Steel Pipe Production - Pipe Billet Heating Furnace

图片
According to the different   seamless steel pipe   production processes, seamless steel pipe production equipment can be used in a variety of ways. However, whether rolling, extrusion, top pressing or spinning and other seamless steel pipe manufacturing processes are used, billet heating equipment is required. Therefore, in the seamless steel pipe production equipment, the billet heating equipment is particularly critical. Now let's discuss the billet heating furnace in seamless steel pipe production equipment. Seamless steel pipe round steel or billet heating furnace is one of the crucial equipment in the production of seamless steel pipe, which must be heated to 1150 degrees round steel after perforation to become gross, for the subsequent shaping, probing, marking and so on to do the most basic work. The basic configuration of seamless pipe billet heating furnace is as follows: 1. Medium-frequency power supply system: 200KW-6000KW, with an hourly output of 0.2-16 tons. ...
发表评论
阅读全文

The Essential Equipment for Seamless Steel Pipe Production

图片
Seamless steel pipes   are manufactured by rolling steel ingots into round bars, then piercing them to create tube blanks (also known as rough tubes), which are further processed into seamless pipes through processes such as hot rolling, cold rolling, or cold drawing. The production of seamless steel pipes involves various production processes and equipment. Whether it is continuous rolling, cyclic rolling, mandrel rolling, or extrusion production processes, it is essential to heat the round bars or tube blanks to the required temperature using an induction heating furnace before feeding them into the rolling or extrusion machines to produce seamless steel pipes. Subsequent processes include straightening, cutting and marking the pipes, and bundling them for storage. The equipment for seamless steel pipe production typically includes a cutting saw, tube blank heating equipment, induction heating furnace, taper piercing machine, Accu-Roll mill, 8-stand three-roll micro tension redu...
发表评论
阅读全文

Small Diameter Seamless Steel Pipe Executive Standard

图片
1. Small diameter   seamless steel pipe   for structural use (GB/T8162-2008) is a seamless steel pipe used for general structure and mechanical structure.   2. Large diameter seamless steel pipe for fluid transport (GB/T8163-2008) is a general seamless steel pipe used for transporting water, oil, gas and other fluids.   3. Seamless steel pipe for low and medium pressure boiler (GB3087-1999) is used to manufacture various structures of low and medium pressure boiler superheat, sanitary stainless steel pipe. Steam pipe, boiling water pipe and locomotive boilers with superheated steam pipe and arch brick pipe with high quality carbon structural steel hot-rolled and cold-drawn (rolled) seamless steel pipe.   4. High-pressure boiler seamless steel pipe (GB5310-1995) is used to manufacture high-quality carbon steel, alloy steel and stainless and heat-resistant steel seamless steel pipe for high pressure and above pressure water pipe boiler heating surface.   5. H...
发表评论
阅读全文

The Differences between Hot-rolling and Cold-rolling of Spiral Pipes

图片
Both hot-rolling and cold-rolling of   spiral pipes   are processes for shaping steel sections or plates, which have a significant impact on the microstructure and properties of the steel. In steel rolling, mostly hot-rolling is used, while cold-rolling is mainly utilized for manufacturing small-sized sections and sheets. First, hot-rolling can disrupt the casting structure of ingots, refine the grain size, and eliminate defects in the microstructure, thereby making the steel texture denser and enhancing mechanical properties. This improvement mainly manifests in the rolling direction, making the steel to a certain extent no longer isotropic; bubbles, cracks, and porosities formed during pouring can also be welded under the action of high temperature and pressure. Second, cold-rolling refers to processing plates or strips into various forms of steel through cold-working methods such as cold-drawing, cold-bending, and cold-extrusion at room temperature. It features rapid formin...
发表评论
阅读全文