Carbon Steel for Custom Industrial Components
LANJIAN produces drawing-based carbon steel components with the specified grade, material form and final condition reviewed against the intended service and manufacturing requirements. Carbon equivalent, welding, heat treatment, final hardness, surface protection and material records are confirmed where applicable before production.
- Grade, Standard & Material Form Confirmed
- Carbon Equivalent & Weldability Reviewed
- Heat Treatment & Final Hardness Defined
- Coating & Material Records When Required
Scope: Drawing-based manufacture of carbon steel components—not carbon steel raw-material supply.
What Carbon Steel Can LANJIAN Work With?
LANJIAN works with carbon steel grades for custom castings, welded fabrications and machined components. The representative grades below cover common general-engineering, temperature-specific, structural and machining applications. The governing standard, material form, section thickness and delivery or heat-treatment condition are confirmed for each project.
Carbon Steel Type | Representative Grades | Material Profile | Suitable Conditions & Components |
General-Purpose Cast Carbon Steel | GB/T 11352: ZG200-400, ZG230-450, ZG270-500 | Mechanical: Grade-specific strength and ductility for general engineering castings. | Conditions: General structural and load-bearing service without special corrosion requirements. |
ASTM A27/A27M: 60-30, 65-35, 70-36 | Weldability: Depends on carbon equivalent, casting section and joint requirements. | Priority: Strength, toughness and weldability. | |
Heat treatment: Final properties depend on the specified condition, such as annealing, normalizing, normalizing and tempering, or quenching and tempering. | Components: Housings, brackets, supports and structural bodies. | ||
Carbon Steel Castings for Temperature-Specific Service | ASTM A216/A216M: WCB, WCC | Service: WCB and WCC are specified for elevated-temperature pressure service; LCB and LCC provide defined low-temperature impact performance. | Conditions: Pressure-containing or temperature-critical service subject to the applicable construction code. |
ASTM A352/A352M: LCB, LCC | Mechanical: Property and impact requirements depend on the grade, service temperature and casting section. | Priority: Service temperature, impact toughness, weldability and inspection requirements. | |
Heat treatment: Must comply with the governing material specification. | Components: Valve and pump bodies, covers and other pressure-containing castings. | ||
Structural Carbon Steel | GB/T 700: Q235B | Mechanical: Low-carbon structural grades with balanced strength and ductility. | Conditions: Welded structures used in general industrial service with appropriate surface protection. |
ASTM A36/A36M | Weldability: Generally suitable for welded fabrication; requirements depend on thickness, carbon equivalent and joint restraint. | Priority: Load capacity, weldability and dimensional stability. | |
EN 10025-2: S235JR | Delivery condition: Plate or section condition must follow the applicable product standard. | Components: Frames, bases, mounting plates and structural supports. | |
Carbon Steel for Machined Components | AISI/SAE: 1018, 1020, 1045 | Mechanical: 1018 and 1020 are low-carbon grades; 1045 provides higher strength and hardness. | Conditions: Components requiring machining, controlled hardness or subsequent heat treatment. |
Machinability: Depends on microstructure, hardness and stock condition. | Priority: Machinability, strength, final hardness and dimensional stability. | ||
Heat treatment: 1045 has a stronger hardening response than low-carbon grades. | Components: Shafts, pins, hubs, sleeves and connecting parts. |
Grades listed under different standards are representative references, not exact equivalents. The governing standard, product form, chemical composition, mechanical properties and delivery condition must be confirmed for each project.
AISI/SAE 1018, 1020 and 1045 are chemistry-based grade designations commonly used for wrought stock—not cast steel grades. The applicable bar, plate or forging specification must also be stated.
For pressure-containing components, the applicable construction code, heat treatment, mechanical or impact testing, NDT and documentation requirements must be agreed before production.
Carbon Steel Characteristics at a Glance
Carbon steel performance cannot be determined by the grade name alone. Chemical composition, microstructure, section size and final material condition jointly affect the component’s mechanical and manufacturing properties.
Carbon Content and Performance
Higher carbon content generally increases achievable strength, hardness and wear resistance, but tends to reduce ductility, formability and weldability. Final properties still depend on the steel grade and material condition.
Carbon Equivalent and Weldability
Carbon equivalent estimates how carbon and other elements affect weld hardening and cracking susceptibility. A higher value may require controlled preheating, heat input, filler material and cooling.
Heat-Treatment Response
Annealing, normalizing, quenching and tempering can modify carbon steel’s microstructure, hardness, strength and toughness. The achievable result depends on composition, section size and treatment parameters.
Toughness and Service Temperature
Carbon steel impact toughness varies with grade, thickness, heat-treatment condition and operating temperature. Impact-loaded or low-temperature components should have a specified test temperature and minimum absorbed-energy requirement.
Machinability and Final Hardness
Machinability depends on microstructure, hardness, inclusions and delivery condition—not carbon content alone. Different conditions of the same grade can produce different cutting behavior and tool wear.
Corrosion and Surface Protection
Bare carbon steel can rust when exposed to moisture and oxygen. Surface preparation and the protective coating system should be selected according to the service environment and required protection period.
What Carbon Steel Requirements Should Be Confirmed Before Production?
A carbon steel specification should define more than the grade name. Before production, confirm the governing standard, material form, required properties, final condition and verification records applicable to the component.
Requirement to Confirm | What to Specify | Why It Matters | |
Grade, Standard & Material Form | Exact grade, governing standard and form such as casting, plate, bar or structural section. | Similar grade designations may have different composition, property and testing requirements. | |
Section Size or Thickness | Critical casting section, plate thickness or bar diameter used for evaluation. | Section size can affect heat-treatment response, through-hardening capability and local mechanical properties. | |
Chemistry & Carbon Equivalent | Required chemical limits and, for welded components, the maximum carbon equivalent and calculation method. | Carbon equivalent helps assess weld hardening and cracking susceptibility. | |
Mechanical & Impact Properties | Yield strength, tensile strength, elongation and any required Charpy energy, test temperature and specimen location. | The grade designation may not define every service-related acceptance criterion. | |
Material Condition, Heat Treatment & Hardness | Required delivery condition, heat-treatment condition, final hardness range, test method and measurement locations. Specify hardened depth when applicable. | These requirements determine the final strength, toughness, machinability and wear response. | |
Welding Requirements | Governing welding code, qualified WPS/PQR requirements, repair restrictions and any required preheat, interpass control or PWHT. | ||
Surface Protection | Exposure environment, surface-preparation grade, coating system, dry-film thickness and areas to remain uncoated | Carbon steel generally requires defined protection when exposed to moisture or corrosive conditions. | |
Verification & Traceability | Material certificate, heat-number traceability, heat-treatment record, required test reports and third-party inspection when specified. | Material records identify the base material, while treatment and test records verify the final condition and acceptance results. |
Carbon Steel FAQ
Carbon steel grades are reviewed according to the component type, governing standard, material form, section size and required final properties. LANJIAN confirms the exact grade and production requirements before quotation rather than treating all carbon steels as interchangeable.
No. “Mild steel” is an informal description for relatively low-carbon steel and does not define an exact grade, composition, mechanical properties or delivery condition. The drawing or purchase specification should identify the required grade and governing standard.
No. Grades from different standards may differ in chemical limits, mechanical properties, thickness ranges, delivery conditions and testing requirements. Any proposed substitute should be approved against the governing specification—not selected only by matching tensile strength.
Carbon equivalent estimates the combined effect of carbon and other elements on weld-zone hardening and cracking susceptibility. It is a screening indicator rather than a complete weldability guarantee; the applicable formula, maximum value, thickness and welding requirements should be confirmed together.
No. Some carbon steel components are supplied in an as-rolled or normalized condition, while others require annealing, normalizing and tempering, or quenching and tempering. The required condition depends on the grade, standard, section size and specified hardness, strength and toughness.
Charpy testing may be required for low-temperature, impact-loaded or safety-critical components, or when required by the governing standard. The specification should define the test temperature, minimum absorbed energy, specimen orientation, sampling location and testing frequency.
No. The requirement depends on moisture exposure, chemicals, operating temperature, storage conditions and expected service life. When protection is required, specify the surface preparation, coating system, dry-film thickness and areas that must remain uncoated.
Verification may include heat-number traceability, a material certificate, chemical analysis, tensile testing, hardness testing and impact-test reports. When subsequent heat treatment changes the material condition, separate heat-treatment records and final property results may also be required.
Need the Right Carbon Steel for Your Component?
Send your drawing or available project details. LANJIAN will review the carbon steel grade and standard, material form, section size, heat-treatment or welding requirements, final hardness, surface protection and required material records before quotation.