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Stainless steel joint internal composition

2019-10-21
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Stainless steel pipe fittings (flange) the internal constituent element is complex, basically have 5 kinds, these 5 kinds of elements are having decisive effect to the performance of stainless steel pipe fittings, beneficial or harmful want to see how you take the content among them.In addition to this main element, standard all-copper joints have other trace elements, such as Cr, Ni, etc., but these trace elements will not be right

Stainless steel joint internal composition

The performance of rusty steel pipe has a certain impact, so it should be strictly controlled.Carbon (1) the performance of carbon steel mainly depends on the carbon content.With the increase of carbon content in the steel, the strength and hardness of the steel increase, while the plasticity and toughness decrease.(2) the mass fraction of silicon in the cast carbon steel of silicon standard plastic joint is 0.2-0.45%, which has little influence on the mechanical properties.A certain amount of silicon is required in order to deoxidize steel. Therefore, silicon is a beneficial element in steel.(3) sulfur is a harmful element in steel, which mainly exists in the form of Fey.It forms eutectic crystals with iron and has a melting point of 989 degrees, much lower than that of steel.In the process of solidification of steel hydraulic joint, sulfide often precipitates out at the grain boundary of steel. Due to its low strength and high brittleness, the mechanical properties of steel are greatly reduced and the phenomenon of thermal embrittlement is easy to occur at high temperature.If the molten steel is poorly deoxidized and contains a lot of FeC, the sulfide forms ternary eutectic with iron and Fe0, which has a lower melting point (about 940 ° c) and is more harmful.Sulfur also has an adverse effect on the welding properties of steel.Therefore, sulfur should be removed as far as possible in steel making.(4) manganese manganese in the cast stainless steel pipe, the quality of manganese requirements for 0.5%-0.8%, its role is deoxidation, desulfurization.(5) phosphorus is also a harmful impurity in steel. The smaller the better, and the mass fraction should be less than 0.06%.

Stainless steel pipe coupling

Stainless steel pipe fittings (flange) the internal constituent element is complex, basically have 5 kinds, these 5 kinds of elements are having decisive effect to the performance of stainless steel pipe fittings, beneficial or harmful want to see how you take the content among them.In addition to this main element, standard PU tube has other trace elements, such as Cr, Ni and so on, but these trace elements will have a certain impact on the performance of stainless steel pipe fittings, so it is also strictly controlled.

carbon

(1) the property of carbon steel transition joint can mainly depend on the carbon content.With the increase of carbon content in steel, the strength and hardness of steel increase and the plasticity and toughness decrease.

(2) in silicon cast carbon steel, the mass fraction of silicon is 0.2-0.45%, which has little influence on the mechanical properties.A certain amount of silicon is required in order to deoxidize steel. Therefore, silicon is a beneficial element in steel.

(3) sulfur is a harmful element in steel, which mainly exists in the form of Fey.It forms eutectic crystals with iron and has a melting point of 989 degrees, much lower than that of steel.In the solidification process of steel, sulfide often precipitates in the grain boundary of steel. Due to its low strength and high brittleness, the mechanical properties of steel are greatly reduced and the phenomenon of thermal embrittlement is easy to occur at high temperature.If the molten steel is poorly deoxidized and contains a lot of FeC, the sulfide forms ternary eutectic with iron and Fe0, which has a lower melting point (about 940 ° c) and is more harmful.Sulfur also has an adverse effect on the welding properties of steel.Therefore, sulfur should be removed as far as possible in steel making.

(4) manganese manganese in the cast stainless steel pipe, the quality of manganese requirements for 0.5%-0.8%, its role is deoxidation, desulfurization.

(5) phosphorus is also a harmful impurity in steel. The smaller the better, and the mass fraction should be less than 0.06%.


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