Large furnace body riveted and welded parts
+
  • Large furnace body riveted and welded parts

1. Introduction to Large Furnace Body Riveted and Welded Parts

Large furnace body riveted and welded parts refer to closed or semi-closed thermal equipment used in industrial production for high-temperature processes (melting, heating, heat treatment, sintering, etc.). They typically consist of a steel structure shell, refractory lining, heating system, temperature control system, etc., with large dimensions (length often exceeding 10m), heavy weight (hundreds to thousands of tons), and high temperature resistance (800~1800℃).

2. Common Materials for Furnace Bodies

Materials must meet requirements for high temperature resistance (800~1600℃), thermal fatigue resistance, corrosion resistance (oxidation/sulfidation/carburization), and high strength.

Classified by components:

Component

Common Materials

Characteristics and Applicable Temperature

Furnace shell steel structure

Q235B/Q345R

Room temperature~350℃ (support frame, low cost)

High-temperature furnace shell/lining plate

S30408 (304H), S31008 (310S)

800~1100℃ (austenitic stainless steel, oxidation resistant)

Radiant tubes/burners

0Cr25Ni20 (310S), Inconel 600

1100~1300℃ (high nickel alloy, carburization resistant)

Furnace rollers/guide rails

253MA (S30815), Cr28Ni48W5

1200℃+ (high chromium-nickel heat-resistant steel, deformation resistant)

Refractory anchors

0Cr25Ni20 (310S), RA330

High temperature corrosion resistant, used to fix refractory materials

Insulation layer

Ceramic fiber modules/lightweight refractory bricks

Thermal insulation (density only 200~500kg/m³)

Welding Method Selection

Method

Applicable Scenarios

Advantages

Gas Tungsten Arc Welding (GTAW)

Thin plates (≤6mm), pipe root welding, precision parts

High quality, low deformation

Flux-Cored Arc Welding (FCAW)

Medium-thick plates (6~50mm) structural welds, on-site installation

High efficiency, strong wind resistance

Submerged Arc Welding (SAW)

Thick plates (>20mm) straight long welds (furnace bottom plate/shell)

Deep penetration, no spatter

 

3. Key Welding Process Steps

Pre-welding preparation: material cutting, forming, groove processing (precision control).

Thorough cleaning: remove oil, rust, water, scale, etc. from groove and adjacent areas.

Assembly positioning weld: use the same welding materials and process as formal welding to ensure positioning weld quality, with appropriate length and spacing. Check assembly gaps and misalignment.

Preheating (if needed): uniformly heat to specified temperature and monitor/record.

Welding process:

Strictly follow WPS and welding sequence.

Control interpass temperature (monitor and record).

For multi-layer multi-pass welding, carefully clean interpass slag and spatter. Ensure good weld fusion and avoid defects.

Monitor key parameters (current, voltage, speed, gas flow, etc.).

Key process controls

Preheating and interpass temperature: Stainless steel/high alloy steel: preheat 100~150℃ (to prevent cold cracking), interpass temperature ≤150℃ (to prevent intergranular corrosion). Carbon steel (Q345R): thick plates require 80~120℃ preheating.

Welding material matching: 310S stainless steel → ER310 welding wire (high nickel-chromium content, heat crack resistant).

Inconel 600 → ERNiCr-3 welding wire (nickel-based alloy specialized).

Deformation control: use "skip welding + symmetrical welding" sequence; preset counter deformation (1~2mm/m) when welding furnace bottom plates.

Large furnace shells use modular segmented welding; each segment is leveled after welding before final assembly.

Post-weld treatment: Austenitic stainless steel: no heat treatment needed (to avoid sigma phase embrittlement), but pickling and passivation required (to improve corrosion resistance). Carbon steel/low alloy steel: 600℃ stress relief annealing (to prevent deformation and cracking).

3. Sealing Assurance

100% of furnace welds undergo helium leak detection or penetrant testing (PT) to ensure airtightness (especially for protective atmosphere furnaces).

Continuous welds avoid interruptions; fillet welds use full penetration design.

Welding Process

Application Scenarios

Cutting Process Used

Flame cutting (CNC cutting), plasma cutting, laser cutting, shearing, sawing. High precision groove processing (such as milling edges, groove cutting machines).

Forming Process

Plate rolling (cylinders, cones), bending (press brake), pressure forming (large press), rolling.

Assembly and Fitting

Use large tooling fixtures and platforms (such as welding positioners, roller stands) to ensure the precise position and dimensions of each component. This is a key step in quality control.

Common Welding Methods

Application Scenarios

Submerged Arc Welding

Suitable for long straight welds and circumferential welds (such as longitudinal and circumferential seams of cylinders).

Gas Shielded Welding

MAG (CO2 or mixed gas), MIG (inert gas). Widely used, highly flexible (manual, semi-automatic, automatic), suitable for various positions and joint types.

Shielded Metal Arc Welding

Suitable for positions difficult to automate, short welds, and repair welding. Lower efficiency, relies on welder skill.

Electroslag Welding

Used for vertical welding of ultra-thick plates (such as box beam diaphragms).

Narrow Gap Welding

Used for butt welding of ultra-thick plates, high efficiency, minimal deformation.

Post-Weld Treatment

 

Stress

Large components generally require overall or local post-weld heat treatment (usually stress relief annealing), removal of slag and spatter, grinding of welds and surrounding areas to release residual welding stress, prevent deformation and cracking, and improve toughness.

Straightening

Flame straightening, mechanical straightening (press, etc.) to control welding deformation.

Machining

Precision machining such as milling, boring, drilling on key mating surfaces and hole positions.

 

We conduct nondestructive testing and inspection of products:

Visual Inspection

Surface defects (cracks, undercut appearance inspection (VT), porosity, arc pits, etc.).

Ultrasonic Testing (UT)

Detect internal defects (lack of fusion, incomplete penetration, slag inclusion, cracks, etc.), especially important for thick plates.

Radiographic Testing (RT)

Directly displays internal defects, commonly used for important butt joints.

Magnetic Particle Testing (MT)

Detect surface and near-surface defects (ferromagnetic materials).

Penetrant Testing (PT)

Detect surface open defects (non-ferromagnetic materials).

Destructive Testing (Sampling)

Such as tensile, bending, impact, hardness, metallographic tests (usually conducted during process evaluation or sampling inspection).

Dimensional Inspection

Check whether overall structural dimensions and key part dimensions meet drawing requirements.

Pressure/Leak Testing (if needed)

Such as hydraulic test, pneumatic test, airtightness test.

4. Specification Range

Large furnace bodies vary greatly in weight, mainly depending on size, refractory thickness, and material grade:

Typical Furnace Weight Reference

Furnace Type

Dimensions (L×W×H)

Weight Range

Constitution Characteristics

Car Bottom Heat Treatment Furnace

5m×3m×2.5m

50~80 tons

70% steel structure, relatively thin refractory layer

Large Aluminum Melting Furnace

10m×6m×4m

150~250 tons

Heavy refractory bricks + high alloy lining (accounts for 40% of weight)

Rolling Heating Furnace

30m×15m×5m

800~1200 tons

Refractory layer thickness 500mm (accounts for over 60% of weight)

Glass Melting Furnace

20m×10m×3m

2000~3000 tons

Special zirconia corundum bricks (density > 3.5g/cm³)

Keywords

Previous: Large kiln body riveted and welded parts

Next： Large riveted and welded parts

Large furnace body riveted and welded parts
+
  • Large furnace body riveted and welded parts

Large furnace body riveted and welded parts

Large furnace riveted and welded parts are used in industrial production for closed or semi-closed thermal equipment for high-temperature processing (smelting, heating, etc.). They usually consist of a steel structure shell, refractory lining, heating system, temperature control system, etc. The materials must withstand high temperatures (800~1600℃). Common welding materials include argon arc welding, flux-cored wire gas shielded welding, submerged arc welding, etc. They are applied in large aluminum melting furnaces and steel rolling heating furnaces.

Contact Information

Contact Us

Phone: +86-18695999359

Email: sales@zszxjx.com

Product Categories

Large welded components

Product Inquiry Related Products File Download

Get a Quote

Note: Please leave your contact information, our professionals will contact you as soon as possible!

Submit

Related Products

Related Products

Ball mill

Ball mill

Rod Mill

(Semi) Autogenous Mill

Mining Hoisting

Single-rope Winding Mine Hoist

Multi-rope friction mine hoist

Well Drilling Hoist

Supporting Equipment

Mining Washing and Selection

Selective Crusher

Centrifuge

Flotation machine

Filter machine

Grading Machine

Mining Auxiliary Equipment

Gear Reducer Series

Category One

Category Two

Crusher Series

Rotary Crusher

Jaw Crusher

Impact Crusher

Cone Crusher

Ball Press Machine

High-pressure briquetting machine

Medium and High Pressure Briquetting Machine

Roller Press

Rotary kiln

Cast and forged parts

Large castings

Large Forgings

Transmission Accessories

Crankshaft

Gear Coupling

Gear

Electro-hydraulic control system

Automation Control

Hydraulic System

Hydraulic cylinder

Other accessories

Large welded components

Wear-resistant products

Engineering Plastics

Roller shaft

COOKIES

Our website uses cookies and similar technologies to personalize the advertising shown to you and to help you get the best experience on our website. For more information, see our Privacy & Cookie Policy

COOKIES

Our website uses cookies and similar technologies to personalize the advertising shown to you and to help you get the best experience on our website. For more information, see our Privacy & Cookie Policy

These cookies are necessary for basic functions such as payment. Standard cookies cannot be turned off and do not store any of your information.

These cookies collect information, such as how many people are using our site or which pages are popular, to help us improve the customer experience. Turning these cookies off will mean we can't collect information to improve your experience.

These cookies enable the website to provide enhanced functionality and personalization. They may be set by us or by third-party providers whose services we have added to our pages. If you do not allow these cookies, some or all of these services may not function properly.

These cookies help us understand what you are interested in so that we can show you relevant advertising on other websites. Turning these cookies off will mean we are unable to show you any personalized advertising.

%E7%AC%AC%E4%B8%80%EF%BC%8C%E6%9C%80%EF%BC%8C%E4%BC%98%E7%A7%80%EF%BC%8C%E5%A2%9E%E5%BC%BA%EF%BC%8C%E4%B8%80%E6%B5%81

Sorry，当前栏目暂无内容!

您可以查看其他栏目或返回 首页

Sorry，The current column has no content!

You can view other columns or return Home