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What Are The Testing Standards of Carbon Steel?
Oct 26, 2020
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Let’s approach carbon steel now in this article: what are the testing standards of carbon steel?
Carbon steel is a kind of iron carbon alloy material, with carbon content of 0.0218% ~ 2.11%, also known as carbon steel. DATANG carbon steel seamless pipe is made by it. Generally, it also contains a small amount of silicon, manganese, sulfur and phosphorus. Generally, the higher the carbon content in carbon steel, the greater the hardness, the higher the strength, but the lower the plasticity.
There are many applications in carbon steel, and it is often used to make iron wire, pull rod, gear, hook nut, weldment, etc. Therefore, the quality of carbon steel has become particularly important. So how to ensure the quality of carbon steel? Let’s mainly see the carbon steel test report.
What test standards should be followed for qualified carbon steel? Today, we'd like to take you to know:
1. Classification of carbon steel
The detection scope of carbon steel includes:
Carbon steel, low carbon steel, high carbon steel, medium carbon steel, carbon steel pipe, ordinary carbon steel, carbon steel elbow, hot rolled carbon steel plate, galvanized carbon steel, cast iron carbon steel, carbon steel tank, etc.
(1) Carbon steel can be divided into three types: carbon structural steel, carbon tool steel and free cutting structural steel. Carbon structural steel can be divided into engineering construction steel and machine manufacturing structural steel;
(2) According to smelting method, it can be divided into open hearth steel and converter steel;
(3) According to deoxidation method, it can be divided into rimming steel (F), killed steel (Z), semi killed steel (b) and special killed steel (TZ);
(4) According to the carbon content, carbon steel can be divided into low carbon steel (WC ≤ 0.25%), medium carbon steel (WC 0.25% - 0.6%) and high carbon steel (WC > 0.6%);
(5) According to the quality of steel, carbon steel can be divided into ordinary carbon steel (high phosphorus and sulfur content), high-quality carbon steel (low phosphorus and sulfur content), high-grade high-quality steel (lower phosphorus and sulfur content) and super high-quality steel.
2. Affecting Factors of carbon steel
Manganese: about 0.25% ~ 0.80%. The harmful effect of sulfur can be reduced by solid solution strengthening, removing FeO and reducing the brittleness of steel. It is beneficial.
Silicon: about 0.10% ~ 0.40%, solid solution strengthening. In addition to the adverse effect of FeO on steel quality. It is beneficial.
Sulfur: FeS and Fe form low melting point eutectic (melting point is 985 ℃). When hot working at 1000 ~ 1250 ℃, the steel will become brittle and crack. It is harmful.
Phosphorus: strength and hardness increased, but plasticity and toughness decreased. "cold and brittle". It is harmful.
3. Test items
Composition analysis, material testing, quality testing, performance testing (tensile properties, compressive properties, corrosion resistance, aging resistance), hardness testing, element content analysis, etc.
4. Test standard
GB/T 11261-2006 Iron and steel determination of oxygen content pulse heating inert gas fusion infrared absorption method.
GB/T 11352-2009 Carbon steel castings for general engineering.
GB/T 13790-2008 Cold rolled low carbon steel sheet and strip for enamel.
GB/T 20972.2-2008 Petroleum and natural gas industries. - Materials for hydrogen sulfide containing environments in oil and gas exploitation. - Part 2: cracking resistant carbon steel, low alloy steel and cast iron.
GB/T 24242.3-2014 Non alloy steel wire rod for wire making. - Part 3: rimmed steel and its substitute low carbon steel wire rod.
GB/T 25053-2010 Hot continuous rolling low carbon steel plate and strip.
GB/T 25053-2010E Hot continuous rolling low carbon steel plate and strip.
GB/T 25149-2010 Test method for passivation film quality of carbon steel in chemical cleaning of industrial equipment.
GB/T 27891-2011 Carbon steel compression fittings.
GB/T 3082-2008 Hot dip galvanized or hot dip galvanized low carbon steel wire with 5% Al mixed rare earth alloy coating for armored cable.
GB/T 31204-2014 Investment casting carbon steel parts.
GB/T 31941-2015 Non nuclear safety grade carbon steel and alloy steel welded steel pipe for nuclear power station.
GB/T 33161-2016 Carburizing steel for automobile bearing.
GB/T 33165-2016 Quantitative analysis method for center segregation of high carbon steel wire rod.
Carbon steel is a kind of iron carbon alloy material, with carbon content of 0.0218% ~ 2.11%, also known as carbon steel. DATANG carbon steel seamless pipe is made by it. Generally, it also contains a small amount of silicon, manganese, sulfur and phosphorus. Generally, the higher the carbon content in carbon steel, the greater the hardness, the higher the strength, but the lower the plasticity.
There are many applications in carbon steel, and it is often used to make iron wire, pull rod, gear, hook nut, weldment, etc. Therefore, the quality of carbon steel has become particularly important. So how to ensure the quality of carbon steel? Let’s mainly see the carbon steel test report.
What test standards should be followed for qualified carbon steel? Today, we'd like to take you to know:
1. Classification of carbon steel
The detection scope of carbon steel includes:
Carbon steel, low carbon steel, high carbon steel, medium carbon steel, carbon steel pipe, ordinary carbon steel, carbon steel elbow, hot rolled carbon steel plate, galvanized carbon steel, cast iron carbon steel, carbon steel tank, etc.
(1) Carbon steel can be divided into three types: carbon structural steel, carbon tool steel and free cutting structural steel. Carbon structural steel can be divided into engineering construction steel and machine manufacturing structural steel;
(2) According to smelting method, it can be divided into open hearth steel and converter steel;
(3) According to deoxidation method, it can be divided into rimming steel (F), killed steel (Z), semi killed steel (b) and special killed steel (TZ);
(4) According to the carbon content, carbon steel can be divided into low carbon steel (WC ≤ 0.25%), medium carbon steel (WC 0.25% - 0.6%) and high carbon steel (WC > 0.6%);
(5) According to the quality of steel, carbon steel can be divided into ordinary carbon steel (high phosphorus and sulfur content), high-quality carbon steel (low phosphorus and sulfur content), high-grade high-quality steel (lower phosphorus and sulfur content) and super high-quality steel.
2. Affecting Factors of carbon steel
Manganese: about 0.25% ~ 0.80%. The harmful effect of sulfur can be reduced by solid solution strengthening, removing FeO and reducing the brittleness of steel. It is beneficial.
Silicon: about 0.10% ~ 0.40%, solid solution strengthening. In addition to the adverse effect of FeO on steel quality. It is beneficial.
Sulfur: FeS and Fe form low melting point eutectic (melting point is 985 ℃). When hot working at 1000 ~ 1250 ℃, the steel will become brittle and crack. It is harmful.
Phosphorus: strength and hardness increased, but plasticity and toughness decreased. "cold and brittle". It is harmful.
3. Test items
Composition analysis, material testing, quality testing, performance testing (tensile properties, compressive properties, corrosion resistance, aging resistance), hardness testing, element content analysis, etc.
4. Test standard
GB/T 11261-2006 Iron and steel determination of oxygen content pulse heating inert gas fusion infrared absorption method.
GB/T 11352-2009 Carbon steel castings for general engineering.
GB/T 13790-2008 Cold rolled low carbon steel sheet and strip for enamel.
GB/T 20972.2-2008 Petroleum and natural gas industries. - Materials for hydrogen sulfide containing environments in oil and gas exploitation. - Part 2: cracking resistant carbon steel, low alloy steel and cast iron.
GB/T 24242.3-2014 Non alloy steel wire rod for wire making. - Part 3: rimmed steel and its substitute low carbon steel wire rod.
GB/T 25053-2010 Hot continuous rolling low carbon steel plate and strip.
GB/T 25053-2010E Hot continuous rolling low carbon steel plate and strip.
GB/T 25149-2010 Test method for passivation film quality of carbon steel in chemical cleaning of industrial equipment.
GB/T 27891-2011 Carbon steel compression fittings.
GB/T 3082-2008 Hot dip galvanized or hot dip galvanized low carbon steel wire with 5% Al mixed rare earth alloy coating for armored cable.
GB/T 31204-2014 Investment casting carbon steel parts.
GB/T 31941-2015 Non nuclear safety grade carbon steel and alloy steel welded steel pipe for nuclear power station.
GB/T 33161-2016 Carburizing steel for automobile bearing.
GB/T 33165-2016 Quantitative analysis method for center segregation of high carbon steel wire rod.
