Quality Control And Guarantee of KOSTACRANE
Quality Assurance
Quality is the life of enterprise, the pursuit of excellence quality is to satisfy the needs of customers; In order to obtain the high quality products, won the trust of customers Kosta company adhere to the "pragmatic, innovation, honest,rigorous"principles, has been committed to satisfy their needs of zero defect on lifting equipment. standard, modernized and advanced production and measurement and control equipment,professional manufacturing and testing team, the quality control concept throughout the product design, fabrication, inspection of the entire process. Each of our equipment quality is powerful guaranteed.
Conventional Testing Project
1. Steel Structure
1.1. All steel material must be inspected by professional QC before storing. Such like: material, size, configuration, weight and allowable deviation. National standard: GB/T 700-2006、GB/T 709-2006、GB/T3274-2007、GB/T 1591-2008.
2.1. All weld groove form, size, welding materials are required to strictly abide by welding procedure specification and blueprint requirements; And ensure the welding quality, the test items include: appearance detection, nondestructive testing (radiographic testing, ultrasonic testing, penetrant testing, magnetic particle testing) etc. to ensure the welding qualified refering to national standard of: GB/T 3323-2005,JB/T 10559 － 2006,JB/T6062-2007.
2. Mechanism Parts
1.1. Wheels are made of casting steel ZG340-640 or low alloy steel ZG50iMn. Wheel tread depth of hardening≥20mm; For casting steel ZG340-640, rolling surface hardness is HB300-350; For ZG50iMn, rolling surface hardness is HB420-480. The mechanical property, accuracy, roughness are accord to standard of JB/T 6392-2008.
2.1. According to mechanical properties, the forging hooks are divided into five strength grades: M,P, S, T, V. Accord to shape, it has single hook and double hook. The hook top is made of DG20, DG20Mn, DG34CrMo. The technology, testing and inspection are refer to GB/T10051-2010.
3.1. Wire rope are crane special steel wire rope, the structure form mainly is 6 × 37 and 6 ×19. its technical requirements, mechanical properties, test method are accorded to GB/T 20118-2006, GB 8919-2006.
3. Assembling Process
1.1. Crane's span, stiffness, camber all technical inspection items are conform to the corresponding national standard and the process inspection standard according to the factory record.
2.1. Before painting some important parts' surface are shot peening to grade Sa2.5 ,Film total thickness is 75μm ～ 105μm. Painting adhesion is accorded to the class I of GB/T 9286.
3.1. Crane do a static load testing of 1.25 times rated load and dynamic load test of 1.1 times the rated load , to test the bearing capacity of the crane and the mechanism function.
4. Radiographic Testing(RT)
X ray, Y ray or neutron ray test material's discontinuity, and show the image on recording medium to inspect its inside defect. This testing is direct but expensive.
5. Ultrasonic Testing (UT)
Use ultrasonic to detect its defects, this is suitable for detection of kinds of metal materials, the internal defect. It is often used for pipe, plate, bar and weld; The test is fast, low cost, and wide application.
6. Penetration Testing (PT)
Use ultrasonic to detect its defects, this is suitable for detection of kinds of metal materials, the internal defect. It is often used for pipe, plate, bar and weld; The test is fast, low cost, and wide application.
7. Magnetic Testing(MT)
Using magnetic leakage and appropriate test to find the discontinuity on specimen surface and near surface .
8. Coating testing
In order to ensure that the quality of coating, the coating film performance testing mainly include the mechanical properties (such as thickness, adhesion, gloss, etc.) and special properties (such as corrosion resistance, oil resistance, acid resistance, etc.). The test instrument include: coating thickness tester, tester, the adhesion tester, film griding instrument, etc.
9. Metal hardness testing
Mainly use static test method, like HB, HRC, HV, HL. HB and HRC are the main method and used more. HB is widely used, HRC is suitable for surface high hardness material, such as heat treatment hardness, etc., to detect metal material's resistance ability by hard Objects.
