Product Overview – What is a Slag Pot?
A slag pot (also known as slag ladle, slag bucket, cinder pot or dross pot) is an essential metallurgical vessel used in steel mills and foundries to collect, transport, and pour molten slag generated during the steelmaking process. These heavy-duty load-bearing devices have a bowl-shaped container with lifting trunnions on both sides for crane handling and tipping operations. Operating at temperatures exceeding 1,600°C, slag pots require outstanding heat resistance, mechanical strength, and structural stability to withstand extreme thermal shock, molten slag corrosion, and mechanical impact during repeated service cycles.
Slag pots primarily serve to carry converter steel slag, refining furnace slag (LF/VD), and ladle casting surplus from continuous casting operations. They are typically fabricated from cast steel materials such as ZG230-450 and ZG270-500, utilizing LF refining furnace and VD vacuum degassing production technology, with the casting process optimized through CAE software simulation.
Why Choose Womic Steel as Your Slag Pot Supplier?
Advanced Casting Technology – Utilize Huazhu CAE casting simulation software to analyze solidification process, ensuring optimized structural integrity and zero casting defects.
High-Purity Refined Steel – Combine EAF primary refining with LF ladle refining to minimize harmful inclusions (S ≤ 0.020%, P ≤ 0.020%), refine grain structure, and deliver superior metal strength.
Strict Quality Control System – Full quality management under ISO 9001:2015, complete inspection reports including chemical analysis, tensile test, and NDT documentation with EN 10204 3.1 or 3.2 certificates.
Extended Service Life – Engineered for durability, Womic slag pots deliver reliable performance exceeding 5,000 cycles through high-temperature mechanical properties, excellent thermal cracking resistance, and stable manufacturing process.
Rigorous NDT Inspection – Trunnions undergo 500mm deep ultrasonic testing to ensure zero internal defects, with Level 1 standards for trunnions and Level 3 for pot body.
Flexible Customization – Fully customizable capacities, dimensions, materials, and surface finishes based on customer drawings and operating conditions.
One-Casting Integrity – All our slag pots are produced in single-piece, one-casting process (integral casting), eliminating weld seams that could become failure points under repeated high-temperature shock loading.
Fast Production Cycle – Efficient manufacturing process with reliable global shipping.
Proven Global Export Experience – Trusted by steel companies across 23+ countries worldwide.
Womic Steel works directly with customers to design and manufacture slag pots based on their specific needs. Using industry standard calculations and finite element analysis (FEA), we ensure each slag pot meets your precise requirements for lifting arrangement, thickness, and geometry.
Technical Specifications – Slag Pot Parameters
Our slag pots are designed, manufactured, and tested in accordance with international standards including ASTM A27 (60-30 Grade), DIN 17182 (GS-16Mn5), BS 3100 (425-A2), JIS G7821 (SC42), and ISO 3755 (230-450 Grade).
Material Grade Options
| Material Grade | Equivalent Standard | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) |
| ZG230-450 | ISO 3755:1991 230-450 | ≥450 | ≥230 | ≥22 |
| ZG270-500 | ISO 3755:1991 270-500 | ≥500 | ≥270 | ≥18 |
| ZG310-570 | ISO 3755:1991 310-570 | ≥570 | ≥310 | ≥15 |
| ZG340-640 | ISO 3755:1991 340-640 | ≥640 | ≥340 | ≥12 |
| GS-16Mn5 | DIN 17182 | 480-630 | ≥300 | ≥22 |
| ASTM A27 60-30 | USA Standard | ≥414 | ≥207 | ≥24 |
| 35CrMo / 40Cr (Trunnion) | JB/T6396-2006 | ≥980 | ≥785 | ≥9 |
Cast Steel Mechanical Properties Requirement (Per ASTM/ISO)
| Property | USA Standard (ASTM A27) | Europe Standard (ISO 3755/ DIN) |
| Tensile Strength (min) | 414 MPa (60,000 psi) | 448 MPa (65,000 psi) |
| Yield Strength (min) | 207 MPa (30,000 psi) | 241 MPa (35,000 psi) |
| Elongation (min) | 24% | 35% |
| Reduction of Area | 35% | 40% |
Capacity & Dimensional Options
| Capacity Range | Weight Range | Volume Range | Dimensions (L×W×H) |
| 5-10 tons | 7-15 tons | 4-10 m³ | Customized per drawing |
| 10-30 tons | 15-35 tons | 8-25 m³ | Customized per drawing |
| 30-60 tons | 25-50 tons | 15-40 m³ | Customized per drawing |
| 60-85 tons | 40-75 tons | 25-50 m³ | Customized per drawing |
| 80-100+ tons | 60-80+ tons | 35-60+ m³ | Customized per drawing |
*Single-piece one-casting capacity up to 300 tons available for special orders.*
Trunnion Specifications
| Parameter | Requirement |
| Material | 35CrMo or 40Cr alloy steel |
| Standard | JB/T6396-2006 |
| NDT Requirement | Level 1 per JB/T5000.14-1998 |
| Testing Depth | Ultrasonic testing within 500mm range |
| Heat Treatment | Quenched and Tempered |
Heat Treatment Conditions
| Condition | Application |
| Normalized | Standard delivery condition, stress relief |
| Normalized + Tempered | Enhanced mechanical properties, improved toughness |
| Annealed | For special requirements, maximum ductility |
| Quenched + Tempered | Maximum strength and wear resistance |
Surface Finish Standards
| Finish Type | Specification | Application |
| Inner Working Surface | ASTM A802 LEVEL 3 (smooth, no slag adhesion) | Prevents slag sticking and buildup |
| Outer Surface | Shot blasting + silver-gray heat-resistant coating | Protects against oxidation and transport damage |
Dimensional Tolerances
| Parameter | Tolerance |
| Overall Dimensions | ±10mm |
| Wall Thickness | ±12.5% |
| Trunnion Alignment | ±5mm |
| Trunnion Concentricity | ≤3mm |
Inspection & Testing Process – Our Quality Control Guarantee
To ensure every custom slag pot meets international safety and performance standards, Womic Steel follows a rigorous 8-step quality control workflow:
| Step | Inspection / Test | Standard / Equipment | Acceptance Criteria |
| 1 | Raw Material Verification | OBLF GS1000 spectrometer | Chemical composition per customer-specified grade (ASTM, DIN, ISO) |
| 2 | In-process Dimensional Check | Laser tracker / CMM | ±10mm on overall dimensions, ±5mm on trunnion positions |
| 3 | Heat Treatment Monitoring | Natural gas kiln with continuous temperature recorder | Time–temperature curve fully traceable |
| 4 | Ultrasonic Testing (UT) | JB/T5000.14-1998 | Trunnion: Level 1 (500mm scan depth); Body: Level 3 |
| 5 | Magnetic Particle Test (MT) | GB/T 9444 | No linear indications > 2mm on critical surfaces |
| 6 | Penetrant Test (PT) | GB/T 9443 | Surface crack detection – zero accept |
| 7 | Mechanical Testing | Tensile / Impact / Hardness | Matches grade-specific min. requirements |
| 8 | Final Visual & Dimensional Release | As-built drawing with check report | 100% traceability to heat number |
Certificate issued: EN 10204 Type 3.1 (standard) or Type 3.2 (with third-party witness). All NDT records are kept for 10 years.
Manufacturing Process – How Our Slag Pots Are Made
Our one-casting (integral casting) process ensures a seamless, weld-free construction that delivers unmatched reliability in high-temperature environments.
Design & Simulation – Use Huazhu CAE casting simulation software to analyze and optimize the solidification process, ensuring structural integrity and zero casting defects.
Wooden Pattern Making – Manufacture precision wooden patterns according to customer specifications and safety standards.
Molding (Sand Casting) – Create sand molds using resin-bonded sand or silica sand for large, complex castings.
Trunnion Casting – Trunnions are cast-in using high-heat insulation risers, manufactured from S355 J2G3 to DIN EN 10250-2, ensuring internal quality and reducing crack potential.
Melting & Refining – Melt in Electric Arc Furnace (EAF), followed by LF ladle refining and VD vacuum degassing to minimize S, P, H, and N contents (S ≤ 0.020%, P ≤ 0.020%). OBLF GS1000 direct-reading spectrometer used for precise chemical composition control before, during, and after melting.
Single-Piece Pouring (One-Casting) – The entire slag pot is poured in one continuous bottom-pouring operation with controlled speed; CAE-simulated solidification ensures optimal grain structure without weld seams.
Heat Treatment – Normalizing / Normalizing + Tempering to eliminate casting stress, ensure uniform internal structure, prevent deformation and cracking. Natural gas heat treatment kiln ensures uniform temperature distribution.
Fettling & Finishing – Remove risers, grind surfaces to smooth finish, shot blast outer surface, machine inner working surface to ASTM A802 LEVEL 3, preventing slag adhesion.
Quality Inspection & NDT – Complete dimensional check, chemical analysis, mechanical testing, and non-destructive examination including UT, MT, and PT.
Coating & Packaging – Apply silver-gray heat-resistant waterproof paint to outer surface; packaging per seaworthy standards with steel frame protection.
Packaging & Shipping – Safe Delivery Worldwide
Womic Steel ensures every custom slag pot is properly protected for international transport, especially for heavy, large castings.
Packaging Standards
| Step | Method | Protection |
| 1 | Surface Protection | Anti-rust oil + plastic film on machined surfaces (inner bowl, trunnion seats) |
| 2 | Edge Protection | Steel corner guards on lifting trunnions and critical edges |
| 3 | Cushioning | Rubber mats and wooden dunnage between slag pots (when multiple units stacked) |
| 4 | Base Support | Custom-fabricated steel saddles with bolted clips to prevent rolling |
| 5 | Outer Wrap | Waterproof tarpaulin with desiccant bags for moisture control |
| 6 | Container / Flat Rack | Secured with steel strapping, chain lashing, and twist locks (ISO 1496-1) |
Shipping Options
Containerized – For medium sizes (up to 12T per unit) in 20ft or 40ft high-cube containers.
Flat Rack / Open Top Container – For larger slag pots (> 12T) to allow overhead crane loading.
Break Bulk / RORO – For extra-heavy or oversized slag pots (≥ 20T), direct vessel loading with customized lifting beams.
Project Cargo Logistics – For complete steel plant shipments, we coordinate with freight forwarders for door-to-door delivery.
Shipping Documentation Provided
● Commercial Invoice & Packing List
● Bill of Lading (Sea/Air)
● Certificate of Origin (Form E, COO as required)
● Mill Test Certificates (EN 10204 3.1 / 3.2)
● NDT Reports (UT, MT, PT)
● Marking & Dimension Record Photos
● Insurance Certificate (if requested)
Deliver Proven Performance
Note: The following cases are representative of real projects Womic Steel has successfully completed. Specific customer names are omitted for confidentiality. Detailed case references and customer visit records are available upon request.
Case 1: 85-Ton One-Casting Slag Pot for a Southeast Asian Steel Mill
Project Background:
A large integrated steel mill in Southeast Asia needed to replace their existing welded slag pots that failed after 8-12 months due to severe thermal cracking under EAF slag handling (1,650°C).
Womic Solution:
Designed with FEA to optimize wall thickness and trunnion geometry.
Manufactured via single-piece one-casting process (no weld seams).
Material: GS-16Mn5 equivalent with LF+VD vacuum degassing (S ≤ 0.015%, P ≤ 0.018%).
100% ultrasonic testing (UT) on critical zones; trunnions scanned to 500mm depth.
Third-party inspection witness by SGS.
Results Delivered:
Service life exceeded 28 months (still in operation at last follow-up).
No thermal crack detected after >4,200 cycles.
Customer has placed repeat orders for additional units.
Case 2: Low-Temperature Flexible Slag Ladles for a Russian Steel Producer
Project Background:
A Russian steel group required slag ladles capable of handling extreme winter conditions (ambient temperature as low as -35°C) without risk of brittle fracture.
Womic Solution:
Selected low-carbon alloy steel with guaranteed low-temperature impact properties (≥27J at -40°C).
Heat treatment: Normalized + Tempered with controlled cooling cycle.
Trunnions were cast-in integrally using 35CrMo material.
Full certification by TÜV (EN 10204 Type 3.2).
Results Delivered:
All units passed sub-zero impact tests.
Continuous trouble-free operation for over 5 years in Siberian environment.
Referrals generated from other regional steelmakers.
Case 3: Weight-Optimized Slag Pots for a North American Steel Plant
Project Background:
A US-based steel plant had limited crane capacity (40 tons max lift), so standard slag pots were either too heavy or too small in volume.
Womic Solution:
Conducted CAE-based topology optimization to reduce weight while maintaining safety factor.
Achieved 18% weight reduction compared to conventional designs.
Material: ZG310-570 with fine-grain treatment.
Machined all seating areas and trunnion bores for perfect interchangeability.
Results Delivered:
Crane cycle time reduced by 12%.
First order of 8 units (2022) → second order of 12 units (2023) → third order of 16 units (2024).
This optimized design is now offered as standard for 30-ton class requests.
More reference cases (including photos, inspection reports, and client reference letters) can be shared after signing a non-disclosure agreement. Womic Steel has supplied over 500 slag pots to steel mills, foundries, and metallurgical plants globally.
Applications – Where Our Slag Pots Are Used
Womic Steel slag ladles are widely used in:
Steel Plants & Ironmaking Facilities – for converter slag handling and transport
Metallurgical Industry – for electric arc furnace and LF refining furnace service
Foundries & Casting Plants – for slag collection and disposal
Mining Operations – for slag processing and transport
Chemical Industries – for high-temperature slag handling
Non-Ferrous Metal Production – for copper and aluminum slag handling
Frequently Asked Questions (FAQ)
Q: What does “one-casting” or “integral casting” mean for a slag pot?
A: It means the entire slag pot – including the bowl and trunnions – is poured in a single continuous operation without any subsequent welding. This eliminates weld seams that can crack under thermal shock and extends service life dramatically.
Q: What material is best for slag pots?
A: The most common and cost-effective material is cast steel (ZG230-450, ZG270-500), which offers excellent high-temperature mechanical properties, good thermal cracking resistance, and weldability for repair. For higher strength or corrosive applications, we also offer alloy steel grades such as GS-16Mn5 per DIN 17182 or ASTM A27 60-30.
Q: How long does a slag pot last?
A: A well-manufactured cast steel slag pot can last over 5,000 cycles when properly operated and maintained. With one-casting construction, average life can exceed 8,000 cycles in many plants. Regular inspection (every 200 uses) and proper coating maintenance further extend service life.
Q: What capacity slag pots can Womic Steel produce?
A: We produce custom slag pots with capacities ranging from 5 to 100+ tons, weighing from approximately 7 to 80+ tons, with volumes from 4 m³ up to 60 m³ and beyond. One-casting process available up to 300 tons.
Q: Can Womic Steel provide slag pots made to international specifications?
A: Yes. We manufacture slag pots compliant with ASTM A27, DIN 17182 (GS-16Mn5), BS 3100 (425-A2), JIS G7821 (SC42), and ISO 3755 standards.
Q: What certifications and documentation do you provide?
A: We provide Mill Test Certificate per EN 10204 Type 3.1 (or 3.2 upon request) including chemical composition, mechanical properties, and NDT results; dimensional check with as-built sketch; heat treatment record chart; and NDT reports (UT, MT, PT). For projects with third-party inspection, we issue 3.2 certificates validated by TÜV, SGS, BV, etc.
Q: What is the expected lifespan of a cast steel slag pot vs cast iron?
A: With proper material selection (cast steel), the service life can be three to four times better compared to cast iron alternatives. Cast steel also offers excellent repair possibilities through welding.
Q: Can the trunnions be repaired or replaced?
A: Trunnions are typically cast-in and designed as integral components. However, cast steel is well-suited to welding, unlike cast iron. For severe damage, consult our engineering team for repair recommendations.
Q: Can slag pots be provided with customized coatings?
A: Yes. We can apply various surface treatments including high-temperature heat-resistant paint (silver-gray), anti-stick coatings for the inner surface to prevent slag adhesion, and corrosion protection coatings for specific operating environments.
Q: How to choose the right slag pot capacity for my steel plant?
A: Capacity selection depends on: furnace size and type (BOF/EAF/LF), slag generation rate per heat, plant logistics and handling equipment (crane capacity, transportation method), and site constraints. Provide us with your operational parameters, and we will recommend the optimal capacity.
Q: Can slag pots be provided with custom lifting arrangements?
A: Yes. We design and manufacture according to your specific lifting configuration requirements, including different trunnion styles (cast-in or bolted), support foot designs, tilting arm configurations, and safety features compliant with local and international lifting regulations.
Ready to get a quote for your slag pot project?
Contact Womic Steel today for competitive pricing, technical support, and fast delivery of custom, one-casting slag pots.
Womic Steel – Your Trusted Slag Pot Manufacturer & Supplier in China
Website: www.womicsteel.com
E-mail: sales@womicsteel.com
Tel/WhatsApp/WeChat:
Victor: +86 15575100681
Jack: +86 18390957568
Womic Steel works directly with customers to design and manufacture slag pots based on their specific needs. Using industry-standard calculations and finite element analysis, we ensure each slag pot meets your precise requirements for engineering, safety, and operation.
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