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Seamless steel pipe mechanical properties Mechanical properties of steel are to ensure that end-use properties of steel an important indicator , it depends on the chemical composition of steel and heat treatment system . In the steel pipe standard , according to the different requirements , provides tensile properties and hardness, toughness , and user requirements of high and low temperature properties . ? tensile strength The specimen in the drawing process , the pull-off exposure to the most vigorous , the cross-sectional area in the original sample from the stress , called the tensile strength , the unit is N/mm2. It represents a metal material under tension to resist damage maximum capacity . The formula is: Where : Fb - pull-off specimen exposure to the most vigorous , N; So - the original specimen cross-sectional area , mm2. ? yield point A metallic material having a yield phenomenal , the specimen during the tensile strength does not increase could continue to spread the stress, called the yield point . If the power down occurs when , should distinguish between upper and lower yield point . Yield point of the unit N/mm2. The yield point : the sample to yield the power first drop occurred before the maximum stress ; lower yield point : When excluding the initial transient effects, the yield phase of minimum stress . Yield point is calculated as : Where : Fs - during tensile yield strength , NSo - the original specimen cross-sectional area , mm2. ? Elongation In the tensile test , the specimen fractured gauge increased its length and the percentage of the original gauge length is called elongation. With s expressed in units of % . The formula is: Where : L1 - specimen fractured gauge length , mm; L0 - the original specimen gauge length , mm. ? Reduction In the tensile test , the specimen fractured cross-sectional area of the reduced diameter at the maximum cross-sectional area to reduce the percentage of the original amount , known as section shrinkage. To ? expressed in units of % . Calculated as follows: Where : S0 - the original specimen cross-sectional area , mm2; S1 - specimen fractured necking at least cross-sectional area , mm2. ? hardness index Metallic materials against a hard surface of the object 's ability indentation called hardness . According to different test methods and scope , can be divided into Brinell hardness , Rockwell hardness , Vickers hardness, Shore hardness , microhardness and high temperature hardness. For pipes commonly used are Brinell , Rockwell , Vickers hardness of three. A, Brinell hardness A ball or a carbide ball diameter , forced into a predetermined test pattern surface , the required hold time after removing the test force , the surface of the sample was measured indentation diameter . Brinell hardness test force value is divided by the surface area of ??the quotient spherical indentation . In HBS , said unit N/mm2. The formula is : Where : F - pressed into the surface of the metal sample test force , N; D - test ball diameter , mm; d - average diameter of the indentation , mm. Brinell hardness measurement more accurate and reliable, but generally only in HBS 450N/mm2 below the metal material , the hard steel or thin sheet is not applicable. In the steel standard, the most widely Brinell hardness , often indentation diameter d to represent the hardness of the material , both intuitive and convenient. Example : 120HBS10/1000130: indicates the ball with a diameter of 10mm in 1000Kgf test force, keeping 30s measured Brinell hardness value of 120N / mm2. Boiler Tube prices 15crmo high-pressure boiler pipe prices 15crmo high pressure boiler tube Price: 6250 yuan / ton Price: 6850 yuan / ton 15 seamless carbon steel pipes prices 15 High Pressure Boiler Tube Price: 13,000 yuan / ton 20G high-pressure boiler pipe prices 20G High Pressure Boiler Tube Current price: 5600.00 yuan / ton Minimum Order : 1 ton Supply Ability: 780 tons Mechanical properties Mechanical properties of steel is to ensure that end-use properties of steel an important indicator , it depends on the chemical composition of steel and heat treatment system . In the steel standard , according to the different requirements , provides tensile properties and hardness, toughness , and user requirements of high and low temperature properties . ? tensile strength Specimen in the drawing process , the pull-off exposure to the most vigorous , the cross-sectional area in the original sample from the stress , called the tensile strength , the unit is N/mm2. It represents a metal material under tension to resist damage maximum capacity . The formula is: Where : Fb - pull-off specimen exposure to the most vigorous , N; So - the original specimen cross-sectional area , mm2. ? yield point Metallic material having a yield phenomenon , the specimen during the tensile strength does not increase could continue to spread the stress, called the yield point . If power down occurs when , should distinguish between upper and lower yield point . Yield point of the unit N/mm2. The yield point : the sample to yield the power first drop occurred before the maximum stress ; lower yield point : When excluding the initial transient effects, the yield phase of minimum stress . Yield point is calculated as : Where : Fs - during tensile yield strength , NSo - the original specimen cross-sectional area , mm2. ? Elongation In the tensile test , the specimen fractured gauge increased its length and the percentage of the original gauge length is called elongation. With s expressed in units of % . The formula is: Where : L1 - specimen fractured gauge length , mm; L0 - the original specimen gauge length , mm. ? Reduction In the tensile test , the specimen fractured cross-sectional area of the reduced diameter at the maximum cross-sectional area to reduce the percentage of the original amount , known as section shrinkage. To ? expressed in units of % . Calculated as follows: Where : S0 - the original specimen cross-sectional area , mm2; S1 - specimen fractured necking at least cross-sectional area , mm2. ? hardness index Metallic materials against a hard surface of the object 's ability indentation called hardness . According to different test methods and scope , can be divided into Brinell hardness , Rockwell hardness , Vickers hardness, Shore hardness , microhardness and high temperature hardness. For pipes commonly used are Brinell , Rockwell , Vickers hardness of three. A, Brinell hardness A ball or a carbide ball diameter , forced into a predetermined test pattern surface , the required hold time after removing the test force , the surface of the sample was measured indentation diameter . Brinell hardness test force value is divided by the surface area of ??the quotient spherical indentation . In HBS , said unit N/mm2. The formula is : Where : F - pressed into the surface of the metal sample test force , N; D - test ball diameter , mm; d - average diameter of the indentation , mm. Brinell hardness measurement more accurate and reliable, but generally only in HBS 450N/mm2 below the metal material , the hard steel or thin sheet is not applicable. In the steel standard, the most widely Brinell hardness , often indentation diameter d to represent the hardness of the material , both intuitive and convenient. Example : 120HBS10/1000130: indicates the ball with a diameter of 10mm in 1000Kgf test force, keeping 30s measured Brinell hardness value of 120N / mm2.
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