Grade 45# Q355 Mild Steel Coils For Mechanical Parts High Strength Structural Components
Product Overview
Middle Carbon Steel Grade 45# and Q355 are engineered for mechanical parts and high-strength structural components, offering superior performance in demanding industrial applications.
45# Steel Specifications
Core Applications: Primarily used in manufacturing mechanical parts that withstand moderate loads and require strength and toughness, often requiring final heat treatment.
Primary Applications:- Shafts: Various drive shafts, machine tool spindles, gear shafts, splined shafts
- Gears and Worms: Automotive transmission gears, machine tool gears (for low-impact applications)
- Connecting Rods and Bolts: Engine connecting rods, high-strength bolts
- Molds and Tools: Mold frames for plastic molds, simple stamping dies, hand tools
- Other Structural Components: Rollers, sleeves, pins
Summary: 45 steel is specialized "machinery parts steel" designed for core moving components within machines.
Q355 Steel Specifications
Key Features:
- Chemical Composition: Low carbon (C≤0.24%) with trace alloying elements (Mn, Si, Nb, V), enhanced through solid solution strengthening and grain refinement
- Properties: High yield strength, excellent plasticity and toughness, superior low-temperature impact toughness, and excellent weldability
- Delivery Condition: Typically delivered in hot-rolled or normalized condition for direct welding and use
Main Product Forms:
Steel Coils/Plates: Hot-rolled coils (Q355B), medium-thick plates (Q355C/D/E)
Sections and Profiles: H-beams, I-beams, angle steel, channel steel, steel pipes
Strips and Bars: Corresponding specialized products
Core Applications: Engineering structures requiring excellent weldability, plasticity, and low-temperature toughness
- Building Steel Structures: Main load-bearing structures for high-rise buildings, factories, stadiums
- Bridge Engineering: Highway and railway bridge steel structures
- Construction Machinery: Cranes, excavators, mining equipment, concrete pump trucks
- Vehicles and Ships: Truck beams, dump truck bodies, ship superstructures, pressure vessels
- Power Transmission Towers and Structures
Summary: Q355 is "engineering structural steel" ideal for the skeleton and shell of large buildings, bridges, and equipment.
Product Specifications
Product Name: Carbon Steel Coil
Length: Customized
Sample: Free
Custom Made: Yes
Grade: Q195/Q235/Q345/A36
Key Word: Hot Rolled Steel Coil
Thickness: 3mm - 6mm
Material: Hot rolled carbon steel
Applications: Can be cut, strip and stamping


Industry Applications
1. Construction and Structural Industries (Mainly using hot-rolled medium-thick coils)
- Steel Structures: H-beams, I-beams, channel steel, angle steel for factories, warehouses, stadiums, bridges, high-rise buildings
- Building Panels: Corrugated sheets and sandwich panels for roofing and walls
- Infrastructure: Power transmission towers, guardrails, scaffolding
2. Automotive Manufacturing (Mainly using high-strength cold-rolled and hot-rolled coils)
- Body Parts: Doors, hoods, trunk lids using cold-rolled sheets
- Structural Components and Chassis: Automotive beams, chassis frames, wheel hubs using high-strength hot-rolled sheets
3. Home Appliances and Hardware (Mainly using cold-rolled and galvanized coils)
- Appliance Housings: Refrigerators, washing machines, air conditioners, microwave ovens
- Metal Furniture: Filing cabinets, bookshelves, bed frames, tables, chairs
- Daily Hardware: Door and window hinges, tools, utensils
4. Container and Packaging Industry
- Metal Packaging: Food cans, beverage cans, chemical drums, aerosol cans using tinplate or chrome-plated sheets
- Containers: Container bodies using weathering steel coils
5. Machinery Manufacturing and Industrial Equipment
- General Machinery: Machine tool housings, gears, shaft parts (using medium carbon steel)
- Agricultural Machinery: Tractor and harvester bodies and components
- Mining Equipment: Conveyor belt supports, mining cars
6. Pipelines and Piping Systems
- Welded Pipes: Straight seam welded pipes for water, gas, oil pipelines, and structural pipes (scaffolding pipes)
7. Surface-Treated Derivatives (Expanded applications through enhanced performance)
- Galvanized Coils: Excellent corrosion resistance for building roofs/walls, automotive parts, home appliances, ventilation ducts
- Color-Coated Coils: Aesthetically pleasing, weather-resistant for building envelopes (airports, stadiums)
- Tin-plated/Chrome-plated Coils: Tinplate for food packaging cans
- Electrical Steel Coils: Silicon steel for motor and transformer cores
Technical Support & Services
Our comprehensive Carbon Steel Coil technical support and services include:
- Expert guidance on product selection and usage
- Assistance with installation and maintenance
- Product training for customers and distributors
- 24/7 technical support for any product-related issues
- Product customization options to meet specific customer needs
- Quality assurance and testing to ensure the highest standards
Our experienced professional team is dedicated to providing exceptional support and service for all Carbon Steel Coil products.
Packing & Shipping
Product Packaging: Carbon steel coils are securely packed on wooden pallets, wrapped with moisture-resistant covers, and strapped with steel bands to prevent transit damage.
Shipping: Products are shipped via reliable carrier services to ensure timely and safe delivery. Shipping costs are calculated based on destination and order weight.