Large Slag Pot Manufacturer | Heavy-Duty 60-100 Ton Slag Ladle for Integrated Steel Mills – Womic Steel

Short Description:

Slag Pot Size: Capacity 60 – 100+ tons (custom up to 300 tons), weight 40 – 80+ tons, volume 25 – 60+ m³, dimensions fully customized. Trunnion: heavy-duty 35CrMo / 40Cr cast-in design with reinforced section.

Material & Standards: ZG310-570, ZG340-640, GS-20Mn5, ASTM A27 65-35. Compliant with ASTM A27, DIN 17182, ISO 3755, JIS G7821. Heat treatment: Normalized + Tempered / Quenched + Tempered. Surface: inner precisely machined to anti-slag profile, outer shot blast + high-temperature aluminum-silver coating (up to 800°C).

Manufacturing Process: Single-piece integral casting – no weld lines. EAF + LF + VD vacuum degassing (S≤0.015%, P≤0.018%). Advanced CAE + solidification simulation. 100% NDT: UT full volume (Level 1 trunnion, Level 2 body), MT, PT, plusPhased Array for critical sections.

Slag Pot Usage: Large BOF converters (200-300t), ultra-high power EAF, secondary metallurgy stations (LF/VD), integrated steel works, non-ferrous smelters (copper/nickel slag), and mining slag disposal.

Womic Steel provides extra-large slag pots up to 100+ tons with proven service life exceeding 8,000 cycles. Our one-casting integrity eliminates weld-induced failures under extreme thermal cycling. Full engineering support, global shipping solutions for heavy lift cargo. ISO 9001, PED, ASME certified. Contact us for turnkey slag handling solutions.

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Product Overview – What is a Large Slag Pot?

A large slag pot (often called a heavy-duty slag ladle, super-capacity slag bucket, or BOF slag converter pot) is a massive metallurgical vessel designed to collect, transport, and discharge molten slag from high-throughput steelmaking furnaces. Unlike standard pots used in medium mills, large slag pots serve integrated steel plants where converters produce 200–350 tons of steel per heat, generating equally large slag volumes weighing 60 to over 100 tons per pot.

These pots operate at 1,600°C – 1,700°C and endure severe thermal shock (from red-hot slag to ambient air during dumping), mechanical impact from crane handling, and chemical corrosion from basic slag components. Their design must also accommodate dynamic loads during tilting and long-term creep resistance under repeated heavy-duty cycles.

Womic Steel’s large slag pots are exclusively produced using single-piece integral casting, eliminating any weld that could become a crack initiation site. Every unit is engineered with finite element analysis (FEA) to balance strength, weight, and thermal fatigue resistance.

Large Slag Pot Manufacturer Heavy-Duty 60-100 Ton Slag Ladle for Integrated Steel Mills – Womic Steel

Why Choose Womic Steel for Your Large Slag Pot Needs?

Advantage	Detailed Benefit
Integral Casting for Extra-large Sizes	Capable of one-casting up to 300 tons, our process eliminates weld seams even at 100+ ton capacities – critical for preventing catastrophic failure in big mills.
Ultra-High Purity Steel	EAF melting + LF refining + VD degassing reduces S to ≤0.015%, P to ≤0.018%, hydrogen to ≤2 ppm, ensuring superior ductility and resistance to hydrogen-induced cracking.
Tailored Thermal Fatigue Design	Thicker wall sections with optimized radius transitions, specially designed stress-relief grooves, and controlled solidification to minimize internal stress concentrations.
Advanced NDT Regime	Full volumetric UT (including trunnion root radius scanning), Phased Array UT for complex geometries, and ACFM for surface crack detection – exceed international standards.
Longest Service Life	Field data from integrated mills show Womic large pots regularly exceed 8,000 cycles before first major repair, vs. 5,000 cycles for conventional welded or multi-part pots.
Heavy-Lift Logistics Support	Tailored transport solutions: flat racks, modular trailers, lift-on/lift-off vessels, and on-site crane coordination. We deliver to any major port worldwide with full insurance coverage.
Third-Party Approvals	We work with DNV, ABS, LR, TÜV for design appraisal and manufacturing surveillance; EN 10204 Type 3.2 certificates available.

Womic Steel collaborates with your engineering team from the concept stage, using FEA and thermal-structural simulation to verify wall thickness, stiffener layout, and trunnion design before we start casting.

Technical Specifications – Large Slag Pot (60–100+ Tons)

Capacity & Dimensional Range

Nominal Capacity (tons)	Typical Weight (tons)	Volume (m³)	Bottom Diameter (mm)	Top Diameter (mm)	Height (mm)
60	45–55	28–35	1,600	2,400	2,100
70	55–65	32–40	1,700	2,550	2,250
80	60–72	36–45	1,800	2,700	2,400
90	68–80	40–50	1,850	2,800	2,500
100	75–90	45–58	1,950	2,950	2,650
>100 (custom)	up to 120+	up to 70+	to be engineered	to be engineered	to be engineered

All dimensions are indicative; final dimensions optimized per your crane clearances and furnace tapping spout height.

Material Grade Recommendations for Large Pots

Grade	Standard	Tensile Strength (MPa)	Yield Strength (MPa)	Elongation (%)	Best Suited For
ZG310-570	GB/T 11352	≥570	≥310	≥15	Cost-effective high-strength, general large BOF/EAF
ZG340-640	GB/T 11352	≥640	≥340	≥12	Higher toughness & creep resistance
GS-20Mn5	DIN 17182	500-650	≥300	≥22	European projects, improved weldability for repair
ASTM A27 65-35	ASTM	≥448	≥241	≥24	North American standards, proven track record
1.6220 (16MnCr5)	EN 10293	600-800	≥400	≥14	Special high-abrasion applications

Trunnion Heavy-Duty Design

Parameter	Requirement for 60–100t Slag Pots
Material	40CrNiMo or 34CrNiMo6 (higher fatigue resistance)
Casting Method	Integral cast with internal chillers to ensure soundness
Heat Treatment	Quenched + Tempered to achieve 32-38 HRC
NDT Standard	ASME Section V, UT on entire trunnion length + radius zone
Safety Factor	4:1 per FEM/ISO 8686 for lifting devices
Proof Load Test	Optional but can be performed with witness

Stage	Temperature	Duration	Cooling
Austenitizing	880–920°C	1.5hr/25mm section	Air or forced air for normalizing
Tempering	560–620°C	2hr/25mm section	Air
(Optional) Stress Relief	520–550°C	4-8 hours	Furnace cool

Heat Treatment Protocol for Large Castings

Surface Protection for Large Slag Pots

Zone	Specification	Purpose
Inner bowl	Precision machined, slope ≥ 8° towards center	Quick slag release, avoid freeze-on
Upper rim	Reinforced with chamfered edge	Impact resistance during slag dumping
Trunnion seating	Machined to H9 tolerance	Precise fit with crane hooks
Outer shell	Blast clean Sa 2.5 + aluminum silicone coating (250μm DFT)	Oxidation resistance up to 800°C

20-50 Ton Slag Pot Medium Capacity Slag Ladle for EAF & LF Steelmaking – Womic Steel

Quality Control for Large Slag Pots – Beyond Standard

For extra-large slag pots, Womic Steel implements a 12-point inspection plan tailored to large castings:

Stage	Inspection	Method / Standard	Acceptance
1	Raw material	Spectrometer + OES	Full ladle analysis
2	Mold verification	3D laser scanning	±2mm profile
3	In-mold temperature	Thermal camera array	Uniform filling
4	Post-pour ultrasonic	Automated UT scanner (64 elements)	No echo above 80% DAC
5	Trunnion zone	Phased Array UT + TOFD	No planar defects > 3mm
6	Magnetic particle	Yoke method full coverage	Zero linear indications
7	Dimensional report	Laser tracker + CMM for trunnion bores	Within ≤1mm on critical fits
8	Hardness mapping	Portable Leeb hardness (20 points)	Uniform ±10HB
9	Mechanical test	Tensile + Charpy-V (-20°C / -40°C)	Meet grade min.
10	Hydrostatic proof (optional)	1.5x working pressure	No leakage or deformation
11	Load test (optional)	1.25x rated capacity on trunnions	Permanent deformation <0.1%
12	Final visual & marking	With high-res photos + video record	Complete traceability

All records are bundled into a Quality Dossier delivered with the product.

01 20-50 Ton Slag Pot Medium Capacity Slag Ladle for EAF & LF Steelmaking – Womic Steel

Manufacturing Process – From Molten Steel to Ready-to-Use Large Slag Pot

● Engineering & FEA – Thermal-structural simulation predicts hot spots, stress concentration, and fatigue life.

● 3D Printed Sand Mold (for complex geometry) – Optional rapid prototyping for intricate rib designs.

● Heavy Pattern Construction – CNC-machined wood/metal pattern for repeated accuracy.

● EAF Melting + LF + VD – Produces ultra-clean steel with tight composition control.

● Bottom Pouring (Single Casting) – Entire pot – bowl, trunnions, and reinforcing ribs – poured in one go.

● Simulated Solidification – CAE-guided risers and chills to eliminate shrinkage voids.

● Heat Treatment – Normalizing & tempering in large-capacity car-bottom furnace (up to 12m length).

● Rough Cleaning & Fettling – Robotic grinding for consistent radius.

● Non-Destructive Examination – Full UT + phased array + MT.

● Machining – Horizontal boring mill for trunnion bores and bowl bottom.

● Final Coating & Marking – High-temp paint + stamped serial number.

● Load-out & Shipping – Using heavy-lift trailers and lashing certificates.

02 20-50 Ton Slag Pot Medium Capacity Slag Ladle for EAF & LF Steelmaking – Womic Steel

Packaging & Shipping of Extra-Large Slag Pots

● Moving 60–100 ton steel castings requires specialized logistics. Womic Steel provides:

● Port of loading: Shanghai, Tianjin, or nearest to our foundry

● Transport method: Flat rack containers (up to 45 tons), open-top containers (up to 35 tons), or break bulk on multi-purpose vessels

● Securing: Custom steel saddles, twist locks, chain lashing with certified lashing certificates

● Marking: Center of gravity, lifting points, weight, and handling instructions in 3 languages

● Documentation: Heavy lift shipping plan, IMO compliance (if no dangerous goods), and insurance up to 110% of invoice value.

We also assist with buyers’ consolidators and provide on-site loading supervision.

04 20-50 Ton Slag Pot Medium Capacity Slag Ladle for EAF & LF Steelmaking – Womic Steel

03 20-50 Ton Slag Pot Medium Capacity Slag Ladle for EAF & LF Steelmaking – Womic Steel

Case Studies – Real Heavy-Duty Performance

Customer names are confidential; authenticated records available on request.

Case 1: 85-Ton BOF Slag Pot for a Brazilian Integrated Mill (CSN)

Challenge: Existing pots cracked after 3,000 cycles, causing unplanned downtime and safety risks.
Solution: One-casting with ZG340-640 steel, FEA-optimized bottom profile, 100mm thick upper rim. UT on trunnion roots with phased array.
Result: First pot reached 10,200 cycles without crack. Purchased 15 more over 3 years.

Case 2: 100-Ton Electric Arc Furnace Slag Pot – Turkish Steel Producer

Challenge: Extreme thermal shock from very high basicity slag (CaO/SiO₂ >3). Traditional pots lasted <1 year.
Solution: High Mo and Ni alloyed grade (similar to GS-20Mn5 modified), forced air quenching after tempering, anti-stick coating on inner surface.
Result: Average life increased to 14 months – 40% longer than any previous supplier. ROI positive within 8 months.

Case 3: 110-Ton Custom Slag Ladle – Canadian Mining & Smelting Complex

Challenge: Trolley clearance limited height to 2.8m while requiring 45 m³ capacity.
Solution: Elliptical shape with reinforced trunnions, designed and cast integrally. Dynamic FEA proved safety.
Result: Delivered in 42 weeks (including engineering), still operational after 6 years.

05 20-50 Ton Slag Pot Medium Capacity Slag Ladle for EAF & LF Steelmaking – Womic Steel

Applications – Where Large Slag Pots Excel

● Basic Oxygen Furnace (BOF) shop – 180t to 350t converters

● Ultra-high power Electric Arc Furnace (EAF) – scrap-based steelmaking

● Secondary metallurgy (LF/VD) – slag holding & transfer

● Non-ferrous smelters – copper flash smelting, nickel matte

● Slag fuming plants – high-temperature slag transport

● Steel foundries with large induction furnaces

Frequently Asked Questions (FAQ) – All new content

Q: Why do large slag pots need to be one-casting rather than welded?
A: Welded seams in large pots undergo enormous thermal stress differences (1,600°C inside to ambient outside). Thermal expansion mismatch creates fatigue cracks at weld toes in as few as 2,000 cycles. Integral casting removes all weld lines, distributing stress uniformly through homogeneous metal.

Q: How do you test a 100-ton slag pot for hidden defects?
A: We combine automated ultrasonic testing (AU) with phased array to scan 100% volume, plus thermography during heat treatment, and magnetic particle inspection on all surfaces. Trunnion zones undergo additional time-of-flight diffraction (TOFD) for crack detection.

Q: Can we use the same slag pot for both BOF and EAF service?
A: Not recommended. BOF slag is more fluid but more chemically aggressive; EAF slag has higher viscosity and contains metallics. We design pot wall angles and linings specifically for one process. Dual-purpose pots often underperform.

Q: What is the typical delivery time for a 70-ton slag pot?
A: 22–26 weeks from final drawing approval. This includes pattern making (4 weeks), casting and heat treatment (6 weeks), NDT (2 weeks), and machining/coating (2 weeks). Rush orders possible with pre-existing pattern.

Q: How many cycles can I expect before first repair?
A: Based on our data from 38 integrated mills, median cycles before any detectable surface crack is 8,200 cycles. Minor grinding can extend life to 12,000 cycles. Complete recertification recommended every 10 years or 15,000 cycles.

Q: Can you supply slag pots with automatic slag detection or temperature monitoring?
A: Yes. We can integrate thermocouples into pot bottom (with protective pockets) and install a mounting pad for radar slag level sensors. Wiring channels are cast-in to avoid external brackets.

Q: What is the maximum outer diameter you can cast?
A: Our foundry accommodates pot top diameters up to 3.6 meters (142 inches). Larger pots can be produced using sectioned casting and welding, but we strongly recommend integral casting for best performance.

Q: Do you offer extended warranty for large slag pots?
A: We offer 18-month / 5,000-cycle warranty – whichever comes first. This is double the industry standard. Optional performance-based guarantee can be negotiated for repeat orders.

Q: How do you verify trunnion strength after a number of cycles?
A: We recommend in-situ portable UT every 12 months. Womic can provide a field inspection kit and training. If excessive wear is found, trunnions can be overlaid with weld metal and remachined.

Q: Can you design a slag pot to fit our existing crane hooks without modifying the crane?
A: Absolutely. We require crane hook profile drawing (including hook opening width, throat depth, and clearance radius). We match trunnion geometry precisely to your existing lifting equipment.