Changsha Xiangjia Metal Materical Co., Ltd.

 Anticorrosive steel pipes are divided into anticorrosive SSAW steel pipes, anticorrosive LSAW steel pipes and anticorrosive seamless steel pipes according to the type of steel pipes. The common form of anticorrosive steel pipes is 3pe anticorrosion. The domestic implementation of the SY/T0413-2002 standard, the standard mainly regulates polyethylene and high-density polyethylene, and the Vicat softening point is no less than 110℃; the thickness of the outer anti-corrosion layer is determine by Germany Standard DIN30670-1991, which mainly are low-density and medium-density polyethylene. Greatly improve the impact strength of the 3PE anti-corrosion layer. SY/T0413-2002 greatly improved the peeling strength and impact resistance of 3PE anticorrosion layer, and clearly stipulated the carbon black content of some special materials, stipulated the mechanical strength and weather resistance of 3PE anticorrosion layer, and enlarged the joint The peel strength (that is, the peel strength of th

The slag viscosity of the  seamless steel pipe  plant is too high. The gas dissolved in the high-temperature liquid metal during welding will overflow in the form of bubbles during the cooling process. If the viscosity of the slag is too large, the bubbles cannot pass through the slag and are blocked near the surface of the weld metal to form pores. The seamless steel pipe manufacture can solve this problem by adjust the chemical composition of the flux and change the viscosity of the slag. The reason why carbon monoxide turns into pores is that the FeO and C in the molten pool of the seamless steel pipe plant have the following recovery response: FeO+C==Fe+CO This reaction is more violent when the molten pool is at the crystallization temperature, because at this time the molten pool has begun to condense and CO gas is not easy to escape, so CO pores are formed in the weld. If the welding wire contains sufficient deoxidizing elements Si and Mn, and the carbon content in the welding wi

 The JCOE straight seam steel pipe manufacturing process is a new type of welded steel pipe forming technology that emerged in the 1990s. The forming process of this technology is to first mill (or plan) the opposite part of the steel plate and then pass it in the width direction of the steel plate. Pre-bending, and then gradually forming in the order of J letter type → C letter type → O letter type. During the forming process, the basic principle is three-point bending mold forming after multiple pressure stamping. Since the raw material of the straight seam steel pipe is formed by multiple progressive molds, the following basic problems must be solved: 1. How to determine the shape of the mold, the stroke of the upper mold and the distance between the lower mold of the molding machine 2. How many stamping times are needed to ensure that the most suitable bending radius and the best open O-shaped steel pipe can be stamped. These problems are related to different steel plate materials,

 The outer galvanized and inner plastic coated steel pipes of  seamless steel pipes  are the same as plastic coated steel pipes, which are based on steel pipes. Should be coated inside and outside. Generally, the inner coating is plastic for anticorrosion, the outer coating used for plastic or galvanized layer or other coating materials can be selected according to the needs of users. Therefore, the seamless steel pipe with galvanized outside and plastic coated inside should be surface pretreated for the base pipe first. The specific treatment steps are as follows: 1. Before shot blasting, the seamless steel pipe should be preheated to remove moisture, and the preheating temperature is 40℃～60℃; 2. The rust removal should reach the Sa2.5 level in GB/T8923, and the depth of the anchor pattern on the surface of the seamless steel pipe is 40μm～100μm; 3. The rust and dust remaining on the surface of seamless steel pipes should be cleaned up; 4. Spraying should be carried out within 4h after