Carbon Steel Plate

Product Description

Carbon steel classification
➤ According to the mass percentage of carbon:
Low carbon steel (C:≤0.25%); medium carbon steel (C:0.25≤C≤0.6%); high carbon steel (C:>0.6%) 
➤According to the quality of steel (mainly the content of impurities sulfur and phosphorus):
Ordinary carbon steel (S≤0.055%, P≤0.045%)
High-quality carbon steel (S≤0.040%, P≤0.040%)
High quality carbon steel (S≤0.030%, P≤0.035%)
 

➤According to different uses, it is divided into:

Carbon structural steel: mainly used for bridges, ships, building components, machine parts, etc.;
Carbon tool steel: mainly used for tools, molds, measuring tools, etc.;

Bao Steel has 12 years of manufacturing experience and can produce carbon steel products of various materials. It has skilled workers with rich production experience, manufactures with heart, and supports product customization. Welcome to contact us for the latest quotation!

1. Chemical Composition

The main components of carbon steel are iron (Fe) and carbon (C), with low content of other elements. The classification is as follows:



Type Carbon (C) Manganese (Mn) Silicon (Si) Sulfur (S) Phosphorus (P)



Low Carbon 0.05%–0.25% 0.3%–0.6% ≤0.3% ≤0.05% ≤0.04%

Medium Carbon 0.25%–0.60% 0.6%–1.0% ≤0.4% ≤0.04% ≤0.04%

High Carbon 0.60%–1.0% 0.3%–0.9% ≤0.4% ≤0.03% ≤0.03%

Notes:

Sulfur (S) and phosphorus (P) are impurity elements. High-quality carbon steel requires strict control of their content (e.g., S ≤ 0.03%, P ≤ 0.03%).

Manganese (Mn) enhances strength and toughness, with its content adjusted according to carbon content.



2. Mechanical Properties

Mechanical properties are closely related to carbon content and heat treatment conditions:



Parameter Low Carbon (e.g., Q235) Medium Carbon (e.g., 45#) High Carbon (e.g., T8)



Tensile Strength 300–500 MPa 500–800 MPa 600–1000 MPa

Yield Strength 200–300 MPa 300–550 MPa 400–800 MPa

Elongation (%) 20%–35% 10%–20% 5%–15%

Hardness (HB) 120–160 160–250 200–350

Notes:

Low Carbon Steel: Excellent plasticity, weldability, and formability, but lower strength. Commonly used in structural components (e.g., buildings, bridges).

Medium Carbon Steel: Offers balanced performance after quenching and tempering. Used for mechanical parts (gears, shafts).

High Carbon Steel: High hardness and wear resistance but brittle. Requires heat treatment (e.g., spheroidizing annealing) to improve machinability. Used for tools, springs, etc.



3. Typical Applications

Low Carbon Steel Plate: Building structures, automobile body panels, pipelines, containers.

Medium Carbon Steel Plate: Mechanical components, connecting rods, gears, high-strength bolts.

High Carbon Steel Plate: Cutting tools, springs, wear-resistant parts, rail tracks.


Types and grades of carbon steel
Ordinary carbon structural steelQ195, Q215, Q235Good plasticity, can be rolled into steel plates, steel bars, steel pipes, etc.
Q225, Q275Can be rolled into shaped steel, steel plate, etc.
High quality carbon structural steel20#, 45#, etc.Mainly used to manufacture various machine parts
Carbon Tool SteelT9, T12 etc.Mainly used to manufacture various props, measuring tools, molds, etc.
Cast steelZG25 etc.It is mainly used to manufacture parts with complex shapes and require certain strength, plasticity and toughness, such as gears, couplings, etc.
What is low carbon steel sheet?
Low-carbon steel plate is a kind of material with a large amount of use, which is divided into ordinary low-carbon steel plate and special steel plate, including low-alloy high-strength steel and corrosion-resistant and heat-resistant clad steel plate. Ordinary low-carbon steel sheets are divided into two types: cold-rolled and hot-rolled. Cold-rolled steel sheets have good surface quality and precise thickness and dimensions, and are mostly used in the manufacture of car bodies. Hot-rolled sheets are mostly used in the manufacture of frames, etc. Ganghua Steel specializes in the production of carbon steel products, has many years of production experience, manufactures with heart, and supports customization!
Common grades and chemical compositions of low carbon steel sheets
GradeLevelChemical composition,%Deoxygenation method
CMnSiSP
No greater than
Q195-0.06~0.120.25~0.500.300.0500.045F、b、Z
Q215A0.09~0.150.25~0.550.300.0500.045F、b、Z
B0.045
Q235A0.14~0. 220.30~0.650.300.0500.045F、b、Z
B0.12~0. 200.30~0.700.045
C≤ 0.180.35~0.800.0400.040Z
D≤ 0.170.0350.035TZ
Q255A0.18~0.280.40~0.700.300.0500.045F、b、Z
B0.045
Classification of low carbon steel plates
According to the thickness, it is divided into: thick plate (above 6mm), medium and thick plate (3-6mm) and thin plate (below 3mm).
According to the process, it is divided into: cold-rolled steel plate, hot-rolled steel plate. Cold-rolled steel plates are generally used for parts that require a large degree of material deformation when forming parts, and there should be no wrinkles, cracks, etc. on the surface. For different parts, different grades of steel plates are used, such as: SPCC is a common cold-rolled steel plate, usually rolled by boiling steel; SPCD is a steel plate for rolling; SPCE or SPCEN is a cold-rolled steel plate for deep drawing.

Rotation of mild steel plate
The drawing and spinning test of a variety of low carbon steel sheets with different metallographic and mechanical properties was carried out, and the following points directly related to the spinnability were obtained.
➤ The maximum elongation strain of aluminum-killed steel sheets of general purity exceeds 250% during deep-spinning.
➤The ultimate elongation of the boiling steel sheet with a slightly poorer purity decreases with the increase of the oxygen content of the steel sheet.
➤ As soon as the grains of the steel sheet are coarsened, the forming limit decreases.
➤ The total elongation, n value and r value in the mechanical properties of the steel sheet have no direct influence on the forming limit of spinning.
The steel plate used in the test is very thin (about 0.5mm), and the steel plate of common thickness (0.8-1.6mm) will definitely be much higher than the above extreme limit.
Medium carbon steel plate
Medium carbon steel sheet is a carbon steel sheet with a carbon content of 0.25% to 0.60%. It includes most high-quality carbon structural steel plates and a part of ordinary carbon structural steel plates. Most of this type of steel is used to make various mechanical parts, and some are used to make engineering structural parts.
Heat treatment method of medium carbon steel plate

The final heat treatment methods of medium carbon steel plate include quenching and tempering, low temperature tempering after quenching, low temperature tempering after high frequency quenching, isothermal quenching and medium temperature tempering after quenching.
➤ Quenching and tempering. The organization is tempered sorbite. This structure has good comprehensive mechanical properties, high strength, good plasticity and toughness. The quenched and tempered steel should have good hardenability to ensure uniform structure and performance on the entire section of the quenched and tempered part. Compared with alloy steel, carbon steel has poor hardenability, so it is only suitable for quenching and tempering of medium carbon steel parts with small section size.


➤ Low temperature tempering after quenching. The organization is tempered martensite, which has high strength and appropriate plasticity and toughness.


➤ Low temperature tempering after high frequency quenching. The structure of the high frequency quenching layer is extremely fine hidden needle martensite, and tempered martensite is obtained after low temperature tempering. This treatment can obtain a similar effect to the carburizing treatment. Quenching and tempering or normalizing are generally carried out before high-frequency quenching. Therefore, after high-frequency quenching and tempering, the core of the part has high strength, good plasticity and toughness, and its surface layer has high hardness and good wear resistance. In addition, the surface layer of high-frequency quenched parts produces compressive stress, which has a high fatigue limit and a long service life.


➤ Isothermal quenching. The organization is bainite, which has high strength and good plasticity and toughness.


➤Temper at medium temperature after quenching. The organization is tempered sorbite.

High carbon steel plate

After proper heat treatment or cold drawing hardening, high carbon steel plate has high strength and hardness, high elastic limit and fatigue limit, and the cutting performance is acceptable, but the welding performance and cold plastic deformation ability are poor. Due to the high carbon content, cracks are prone to occur during water quenching, so double-liquid quenching is mostly used, and oil quenching is mostly used for small-section parts. This type of steel is generally tempered or normalized at medium temperature after quenching or used in a surface quenched state. Mainly used in the manufacture of springs and wear-resistant parts. Carbon tool steel is a high carbon steel that basically does not add alloying elements, and it is also a steel with low cost, good cold and hot workability, and a wide range of use among tool steels. Its carbon content is 0.65 to 1.35%, and it is a steel specially used for making tools. The density of high carbon steel is 7.81g/cm³. Can be used for the production of fishing gear.

Performance characteristics of high carbon steel plate

Advantage:
➤High hardness (HRC60-65) and good wear resistance can be obtained after heat treatment.
➤ The hardness is moderate in the annealed state and has good machinability.
➤The raw materials are easily available and the production cost is low.


Shortcoming:
➤ Poor thermal hardness. When the working temperature of the tool is greater than 200 °C, its hardness and wear resistance drop sharply.

➤ Low hardenability. When water quenching, the diameter of fully hardened is generally only 15-18mm; when oil quenched, the maximum diameter or thickness of fully hardened is only about 6mm, and it is easy to deform and crack.

High carbon steel welding process

➤ In order to obtain high hardness and wear resistance of high carbon steel materials, the material itself needs to be heat treated, so it should be annealed before welding before welding.


➤The weldment should be preheated before welding. The preheating temperature is generally above 250~350℃, and the interlayer temperature must be kept not lower than the preheating temperature during the welding process.


➤ After welding, the weldment must be kept warm and slowly cooled, and immediately sent to the furnace for stress relief heat treatment at 650 °C.


➤ The carbon content of high carbon steel is relatively high, and the weldability is relatively poor. It should be preheated during welding, and should be slowly cooled or tempered at 350 degrees after welding. The specific heat treatment time depends on the thickness of the workpiece. decided. If it is not possible to preheat, it has to be matched with welding materials with good welding performance and good crack resistance, but the welding speed must be reduced.


➤ High carbon steel belongs to the category of poor welding performance. If welding is to be carried out, it should be welded under preheating conditions, and stress relief heat treatment must be carried out after welding.

Epilogue

Bao Steel can produce medium carbon steel plate, low carbon steel plate, high carbon steel plate, weathering steel plate, wear-resistant steel plate, flat sheet, carbon steel plate, low alloy carbon steel plate, cold rolled/hot rolled carbon steel plate, etc. The factory has a complete production line and experienced technical workers, manufacturing attentively, quality assurance, support for product customization, welcome to contact us!


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Company Profile

BAOSTEEL Co., Ltd is a comprehensive company, who is founded in 2008. Specialized in Carbon steel, alloy steel, galvanized steel in pipe and tube,plate and coil,profiles.

We are located in Tianjin Province, the Steel base of China, It is well-known all over the world. We are close to Tianjin Seaport, that is much convenient in carriage.

We welcome all users, manufacturers and traders to cooperate with us

Since our establishment, we have always adhered to the business policy of "Quality for Survival, Product for Development, Credibility for Cooperation and Service for Customer". Under the guidance of this business policy, our company acts as a perennial distributor of steel pipe, steel plate, steel coil, steel rod, steel profiles of Angang Steel, HBIS, JISCO,SGHB ,and etc.

Modern large-scale outdoor storage and indoor storage have been set up in our company, and 20,000 tons of available goods have been prepared.

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Pre-sale Service

1.We provide samples free of charge, but the freight should be paid by the buyer.
2. We have full stock,and can deliver within short time.Many styles for your choices. 
3. OEM and ODM order are accepted, Any kind of logo printing or design are available.
4. Good Quality + Factory Price + Quick Response + Reliable Service, is what we are trying best to offer you.
5. All of our products are produce by our professional workman and we have our high-work-effect
foreign trade team, you can totally believe our service. 

After you choose

1. We will count cheapest shipping cost and make invoice to you at once.
2. Check quality again, then send out to you at 1-2 working day after your payment,
3. Email you the tracking no, and help to chase the parcels until it arrive you.

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1. We are very glad that customer give us some suggestion for price and products.
2. If any question,please contact with us freely by E-mail or Telephone.

FAQ

Q1:Can you send samples?
A:Of course, we can provide customers with free samples and express shipping service to all over of the world.

Q2:What product information do I need to provide?
A:Please kindly provide the grade, width, thickness, surface treatment requirement should you have and quantities you need to purchase. 

Q3:It's my first time to import steel products, can you help me with it?
A:Sure,we have agent to arrange the shipment, we will do it together with you.

Q4:What ports of shipment are there?
A:Under normal circumstances, we ship from Shanghai, Tianjin, Qingdao, Ningbo ports, you can specify other ports according to your needs. 

Q5:What about product prices information?
A:Prices various according to periodic price changes of raw materials. 

Q6:What is your terms of payment ?
A:Payment<=1000USD, 100% in advance. Payment>=1000USD, 30% T/T in advance ,balance before shipment or based on BL copy or LC at sight.

Q7.Do you provide custom made Products service?
A: Yes,if you have your own design , we can produce according to your specification and drawing.

Q8:What are the certifications for your products?
A:We have ISO 9001, MTC, third parties’ inspections are all available such SGS, BV ect.

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