ASTM-SA516Gr60Z35 steel plate flaw detection:
1. SA516Gr60 executive standard: American ASTM, ASME standards
2. SA516Gr60 belongs to low temperature pressure vessel with carbon steel plate
3. Chemical composition of SA516Gr60
C≤0.30, Mn: 0.79-1.30, P≤0.035, S: ≤0.035, Si: 0.13-0.45.
4. Mechanical properties of SA516Gr60
SA516Gr60 tensile strength of 70 thousand pounds/square inch, the main element content is C Mn Si p s control determines its performance. Other trace elements less. Asme Standard Specification for carbon steel plates for medium and low temperature pressure vessels.
5. Delivery status of SA516Gr60
SA516Gr60 steel plate is usually supplied in rolling state, steel plate can also be normalized or stress relief, or normalizing plus stress relief order.
SA516Gr60 thickness >40mm steel plate should be normalized.
Unless otherwise specified by the demander, the thickness of steel plate ≤1.5in, (40mm), when there are notched toughness requirements, should be normalized.
6. SA516Gr60 is used to manufacture single-layer coil welding container, multi-layer hot sleeve coil welding container, multi-layer dressing container and other two and three types of containers and low-temperature pressure vessels. Widely used in petroleum, chemical industry, power station, boiler and other occupations, used in the manufacture of reactors, heat exchangers, separators, spherical tanks, oil and gas tanks, liquefied gas tanks, boiler drum, liquefied petroleum steam cylinders, hydropower station high-pressure water pipes, turbine volute and other equipment and components.
7. When the austenite is cooled slowly (equivalent to furnace cooling, as shown in Fig. 2 V1), the transformation products are close to the equilibrium structure, namely pearlite and ferrite. With the increase of cooling rate, that is, when V3>V2>V1, the undercooling of austenite gradually increases, and the amount of precipitated ferrite becomes less and less, while the amount of pearlite gradually increases, and the structure becomes finer. At this time, a small amount of precipitated ferrite is mostly distributed on the grain boundary.
8. Therefore, the structure of v1 is ferrite+pearlite; The structure of v2 is ferrite+sorbite; The microstructure of v3 is ferrite+troostite.
9. When the cooling rate is v4, a small amount of network ferrite and troostite (sometimes a small amount of bainite can be seen) are precipitated, and the austenite is mainly transformed into martensite and troostite; When the cooling rate v5 exceeds the critical cooling rate, the steel is completely transformed into martensite.
10. The transformation of hypereutectoid steel is similar to that of hypoeutectoid steel, with the difference that ferrite precipitates first in the latter and cementite precipitates first in the former.
Post time: Dec-14-2022
