Changsha Xiangjia Metal Materical Co., Ltd.

1. Seamless steel pipes shall be submitted for acceptance in batches, and the rules shall comply with the provisions of the product standards. 2. The inspection items, sampling quantity, sampling locations and test methods of seamless steel pipes shall be in accordance with the provisions of the corresponding product standards. With the consent of the purchaser, hot-rolled seamless steel pipes can be sampled in batches according to the rolling root array. 3. Test results of seamless steel pipes. When some of them does not meet the requirements of the standard, the unqualified items shall be singled out, and double the number of samples shall be taken from the same batch of straight seam steel pipes for unqualified items. If the re-inspection result (including any index required by the project test) fails, the batch of seamless steel pipes shall not be delivered. The following inspection items are not allowed to be re-inspected when the initial inspection fails: a. There are whit

Precision seamless steel pipe is a kind of high-precision steel pipe after cold drawing or hot rolling. The precision seamless steel pipe has no oxide layer, and can withstand high pressure with no leakage, high precision, high finished, non- deformation in cold bending, flaring, and no cracks during flattening. So that the precision seamless steel pipe used to produce pneumatic or hydraulic components, such as cylinders or oil cylinders. 　 Features of precision seamless steel pipe 1. Smaller outer diameter. 2. High precision can be used for small batch production. 3. Cold drawn products have high precision and good surface quality. 4. The horizontal area of steel pipe is more complicated. 5. The steel pipe has better performance, and the metal is denser. Standard: GB/T3639, GB/T8713, DIN2391-2, HK15-2000 Whatsapp: +86 15920063508 Email: lily@adtooo.com

Seamless steel pipe is a pipe without a seam or a weld-joint. Seamless steel pipe is a tubular section or hollow cylinder, usually but not necessarily of circular cross-section. They are mainly used to convey substances which can flow — liquids and gases (fluids), slurries, powders and masses of small solids. 1. Bearing steel pipe (YB / Z12—77): It is mainly used for manufacturing rolling bearing rings. 2. Hydraulic pillar pipe: It is mainly used for manufacturing hydraulic pillar, lifting pillar and inner cylinder of hydraulic oil cylinder for coal mine shaft. 3. Carbon steel seamless steel pipe for marine (GB / T5312-1999): It is mainly used for manufacturing Class 1 and 2 pressure-resistant pipes for ships. 4. Cold-rolled seamless special-shaped steel pipe (GB / T3094—1999): It is mainly used for manufacturing general structural parts. 5. Seamless steel pipe for fluid transportation (GB / T8163—1999): It is mainly used for transportation pipelines. For example: central

We know that the quality of the welded seam determines the quality of the  LSAW steel pipe . Once the porosity of the LSAW steel pipe, it will not only affect the tightness of the welded pipe, cause leaks in the pipe, but also become an induced point of corrosion. Reduce weld strength and toughness.  In general, moisture, dirt, scale and iron filings in the flux, welding composition and thickness, surface quality of the steel plate, treatment of the steel plate side plate, welding process and steel pipe forming process, etc. may be the cause of the porosity of the weld. Therefore, during welding, if the welding temperature is high, the weld seam will be over-burned to form a perforation. When it contains the appropriate amount of CaF2 and SiO2, it will react and absorb a large amount of H2, generating HF with high stability and insolubility in liquid metal. Prevent the formation of hydrogen holes; the forming factor of the weld is too small, the shape of the weld is narrow and

Every step is important during the operation of  galvanized seamless steel pipe . The pre-plating process includes 5 processes: alkaline washing, pickling, rinsing, dipping assistant, and drying. For operation workers, what they have to paid attention when pickling seamless steel pipes? Here, we made a list. 1. Wearing protective equipment before pickling. The on-site environment should also be inspected carefuly, mainly to check whether the sling of the steel pipe is intact, and the operation can only be performed after confirming that the sling is intact. 2. Pickling is mainly performed by hydrochloric acid. Generally, the content of hydrochloric acid is 18% to 20%. 3. The staff also need to check the acid concentration & temperature and the tonnage of the pickling pipe before operation. These can be detected by using professional measuring equipment. 4. For pickled steel pipes, the appropriate weight is between 2 to 5 tons at a time, and should controll in 5 t

Seamless steel pipe , as the name suggests, is a pipe without a seam or a weld-joint. Seam steel pipe are generally welded with a seam. 1. Different Processing Technology: seamless steel pipe is made of high quality carbon steel or alloy steel. The processing technology of seamless steel pipes are cold drawn and hot rolled, and seam steel pipe are generally welded. 2. Different Uses: seamless steel pipes are mainly used as pipelines for conveying fluids, or structural parts in machinery industry, and seam steel pipes are mainly used in construction industry, such as low-pressure fluid, like water, gas, compressed air. But when must to use pressure pipes, seamless steel pipes is the better choice. 3. Different Pressure-bearing: the maximum working pressure that the seamed pipe can withstand is within 20 kg, which is the safest range of use. It is generally used for low-pressure fluids such as water, gas, and compressed air. Seamless steel pipe can withstand ultra-high pre

Seamless steel pipe  are widely used in industrial production due to its good performance. In order to protect seamless steel pipes from rust, we need to galvanize the seamless steel pipes. Usuallt, seamless steel pipe may be sold in a short period of time after produced in large amount. So that it is nessary to do zinc coating. So how do it proceed? There are two methods for galvanizing seamless steel pipes, hot-dip galvanizing and electro-galvanizing. Hot-dip galvanizing includes wet method, dry method, lead-zinc method, and redox method. Electro-galvanizing is a process that uses electrolysis to refer to the process of forming a uniform, dense, and well-bonded metal on the surface of a part. The galvanized zinc layer is very smooth and dense, and has good corrosion resistance and mechanical properties. The difference of hot-dip galvanizing and electro-galvanizing is how to improve the quality of seamless steel pipe after acid cleaning. Hot-hip galvanized used widely th

API 5L/ASTM A106 GR.B, Seamless Steel Pipe DN DD SCH40(6M/5.8M) SCH80(6M/5.8M) SCH160(6M/5.8M) WT(mm） FOB(usd/t) WT(mm） FOB(usd/t) WT(mm） FOB(usd/t) 1/2'' 21.3 2.77 732.38 3.73 732.38 4.78 785.96 3/4'' 26.7 2.87 712.88 3.91 712.88 5.56 752.61 1'' 33.4 3.38 639.68 4.55 639.68 6.35 665.23 2'' 60.3 3.91 580.1 5.54 580.1 8.74 606.58 3'' 88.9 5.49 580.22 7.62 580.22 11.13 606.85 4'' 114.3 6.02 578.12 8.56 578.12 13.49 578.12 5'' 141.3 6.55 578.12 9.53 578.12 15.88 578.12 6'' 168.3 7.11 570.98 10.97 570.98 18.26 570.98 8'' 219.1 8.18 568.35 12.7 568.35 23.01 592.55 10'' 273 9.27 567.81 15.09 567.81 28.5

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1. In the production process of  ERW steel pipe , how to ensure that the product quality meets the requirements of technical standards and the needs of customers? An analysis of the factors that affect the product quality during the production of steel pipes. According to the statistics of non-conforming products of Φ76mm high-frequency welded steel pipe unit in a certain month, it is believed that the factors that affect the quality of steel pipe products during the production process are raw materials, welding process, roll adjustment, roll material, equipment failure, production environment, and other reasons. aspect. Raw materials accounted for 32 .44%, below will introduce the infect of material to ERW steel pipe. The influence of raw materials on the ERW steel pipes. The factors that affect the quality of raw materials are mainly the three aspects of the unstable mechanical properties of the steel strip, the surface defects of the steel strip and the large deviations in ge