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

Short Description:

Slag Pot Size: Capacity 20 – 50 tons (custom), weight 25 – 60 tons, volume 15 – 35 m³, dimensions per drawing. Trunnion: cast-in 35CrMo or 40Cr with reinforced fillet.

Material & Standards: ZG270-500, ZG310-570, GS-20Mn5, ASTM A27 65-35. Compliant with ASTM A27, DIN 17182, ISO 3755, JIS G7821. Heat treatment: Normalized + Tempered. Surface: inner machined to anti-adhesion profile, outer shot blast + high temp aluminum coating.

Manufacturing Process: One-piece integral casting – no weld seams. EAF + LF + VD degassing (S≤0.020%, P≤0.020%). CAE solidification simulation. 100% NDT: UT (Level 1 trunnions, Level 2 body), MT, PT. Optional Phased Array UT.

Slag Pot Usage: Medium-sized EAF (50-100t), LF refining, small BOF converters, foundries, copper/nickel smelters, slag transportation in steel plants.

Womic Steel offers medium slag pots engineered for 5,000–8,000 cycles with high thermal fatigue resistance. Our integral casting eliminates weld line cracks. Custom design for your existing crane capacity. ISO, PED certified. Quick delivery (35–55 days). Get your medium slag pot quote today.

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Product Overview – Why Medium Slag Pots Are the Backbone of Many Steel Mills

Medium slag pots (20–50 tons) are the most common slag handling vessels in small to mid-sized steel mills, specialty steel plants, and foundries. They serve multiple furnace types:

● 50–100 ton EAF (most common scrap-based steelmaking)

● LF ladle furnaces for secondary refining

● BOF converters up to 120 tons (slag splitting)

● Non-ferrous smelters (copper, nickel, lead)

● Large foundries with 30–60 ton induction furnaces

Unlike small pots (5–15t) that are often used in batch operations, or large pots (60–100t) for giant integrated mills, medium pots operate at moderate but intense cycling – typically 10–15 heats per day, 5–6 days a week. They require a balance of capacity, durability, and cost.

The main failure mode for medium pots is not thermal fatigue (as in EAF pots) or creep (as in BOF pots) – it is mechanical impact + thermal shock combined. Medium pots are often transported over rougher floors, tilted with less precise cranes, and sometimes stored outdoors, leading to uneven cooling.

Womic Steel has optimized our medium slag pot design to address these specific challenges:

● Enhanced impact resistance – thicker rim and bottom reinforcement

● Reduced stress concentration – larger fillet radii at all transitions

● Corrosion allowance for outdoor storage – extra 3mm wall thickness on external surfaces

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

Why Choose Womic Steel for Your Medium Slag Pots?

Feature	Benefit for Medium Mills
Optimized Wall Thickness	10–15% thicker than standard, yet under 60 tons – fits most medium mill cranes (50–80t capacity).
Reinforced Rim Zone	25% thicker at slag impact area + replaceable wear strips (optional) – reduces deformation from careless dumping.
Controlled Chemistry with Trace Elements	Added Cr (0.3%) and Ni (0.3%) improves hardenability and impact toughness at low ambient temperatures.
Full Penetration Trunnion Casting	Trunnions cast integrally with extra metal in root fillet – exceeds FEM standards for lifting.
Surface Finish Guarantee	Inner bowl machined to ≤6.3µm Ra, outer surface to ≤25µm Ra – minimizes slag adhesion and cleaning time.
10-Year Design File	We keep your pot’s CAD, casting simulation, NDT records, and chemical analysis for a decade – traceability for audits.
Fast Spare Part Service	Replacement wear rings, trunnion caps, and coating repair kits shipped within 2 weeks.

Womic Steel also offers retrofit design – if you have existing medium pots that are underperforming, we can analyze their failure mode and provide replacements with corrected geometry.

Technical Specifications – 20–50 Ton Slag Pot

Capacity vs. Typical Application

Nominal Capacity (tons)	Pot Weight (tons)	Volume (m³)	Best Suited For
20	22–28	12–15	50t EAF, small foundry
25	28–34	15–18	70t EAF, LF station
30	33–40	18–22	80-100t EAF, 100t BOF
40	42–52	24–28	120t BOF slag splitting, medium copper smelter
50	52–62	29–35	150t EAF (partial slag), large LF

Allpots are weight-optimized to fit customer’s crane capacity – we adjust wall thickness distribution accordingly.

Material Selection Guide for Medium Duty

Grade	Min Yield (MPa)	Impact Temp	Wear Resistance	Cost	Best for
ZG270-500	270	20°C	Medium	$	General purpose, mild climate
ZG310-570	310	0°C	High	$$	Heavy-duty, cold winters
GS-20Mn5	300	-20°C	High	$$$	European spec, low temp operation
ASTM A27 65-35	241	-30°C	Medium	$$	US projects with impact requirement

Our pick for most medium mills: ZG310-570 with normalized + tempered – best price/performance ratio.

Medium Pot Dimensional Tolerances

Parameter	Tolerance	Measurement Method
Overall height	±8mm	Laser scanner
Top rim diameter	±5mm	Tape + calibrated template
Trunnion position (centerline)	±3mm	CMM
Trunnion bore concentricity	≤1mm	Dial gauge
Wall thickness	-0% / +10%	Ultrasonic thickness gauge (5 points per quadrant)

Trunnion Design for Medium Capacities

Parameter	Value
Material	35CrMo or 40Cr (or 34CrNiMo6 for high cycle)
Design safety factor	4:1 per FEM 9.511
Surface finish	Machined to Ra 3.2µm
NDT	UT 100% + magnetic particle on radius
Hardness	280–320 HB (quenched & tempered)

Quality Control – Beyond Standard for Medium Pots

We apply a 10-step QC plan tailored to medium-sized castings:

1. Raw material verification – OBLF spectrometer analysis per heat.

2. In-mold temperature monitoring – thermal camera records filling pattern.

3. Post-solidification visual – check for obvious shrinkage or flash.

4. Heat treatment recording – thermocouple in dummy block ensures proper cycle.

5. Full volume UT – automated scanner with 80% DAC sensitivity.

6. Trunnion root radius MT – using flexible magnetic yoke.

7. Wall thickness mapping – ultrasonic A-scan at 40 grid points, report with color map.

8. Dimensional check – laser tracker for overall, calipers for details.

9. Hardness test – 10 points per pot (body, rim, trunnion).

10. Final pressure test (optional) – water fill at 1.5x service pressure.

All results are compiled into a Quality Assurance Report sent with the shipment.

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

Manufacturing Process – Medium Slag Pot Production Flow

1. Pattern making – CNC wood pattern with shrinkage compensation (2%).

2. Molding – Resin-bonded sand, automated mold line.

3. Core making – For bowl cavity and trunnion bores.

4. Melting & refining – 8-tons EAF + LF + VD (vacuum degassing).

5. Pouring – Continuous bottom pour at 1,580–1,620°C.

6. Solidification – CAE-simulated riser placement and chilling.

7. Shakeout & fettling – Robotic grinding and cutting.

8. Heat treatment – Normalizing (890°C) + tempering (600°C) in carbottom furnace.

9. NDT – UT, MT, PT as per plan.

10. Machining – Horizontal boring mill for trunnions + bowl finish.

11. Coating – Outer: blast to Sa 2.5, apply silicone-aluminum paint (2 coats).

12. Marking & packing – Stamping + barcode label + waterproof wrap.

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

Packaging & Shipping for Medium Slag Pots

Medium pots (up to 50 tons) can be shipped cost-effectively:

Up to 30 tons – 40ft open-top container, single pot with wooden dunnage.

30–50 tons – Flat rack container or break bulk.

Multiple unit orders – Stillage frames allow 2–3 pots per container.

Included documentation:

● Mill Certificate EN 10204 3.1

● NDT reports (UT maps, MT photos)

● Dimensional check report

● Heat treatment chart

● Packing list with photos of loaded container.

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

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

Case Studies – Medium Mills That Upgraded

Case 1: 35t Slag Pot for a Turkish EAF Mill (90t furnace)

Problem: Existing pots deformed at rim after 18 months, causing slag spillage.
Solution: ZG310-570 with reinforced rim (70mm vs 50mm), normalizing + tempering, anti-adhesion inner coating.
Result: No deformation after 3 years. Reordered 7 pots.

Case 2: 50t Slag Pot for a Canadian Steel Foundry (outdoor operation)

Problem: Pots cracked in winter due to -35°C ambient.
Solution: GS-20Mn5 with -40°C impact test (27J min). Also added drain hole to empty residual water before freezing.
Result: Zero cracking after 2 full winters. Customer extended contract.

Case 3: 25t Slag Pot for an Indian LF Station

Problem: Frequent sticking of high-alumina synthetic slag.
Solution: Double-slope inner profile (10° / 6°) + finer machining (Ra 3.2µm).
Result: Slag release time reduced from 25 minutes to 12 minutes – significantly faster turn-around.

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

Applications – Where Medium Slag Pots Excel

● EAF steel mills (50–120t capacity)

● LF ladle furnaces (slag holding and slag skimming)

● BOF converter plants (secondary slag pots for smaller heats)

● Copper smelters (flash furnace slag transport)

● Ferroalloy plants (high-silicon slag)

● Heavy foundries (iron and steel castings)

Frequently Asked Questions (FAQ) – Medium Slag Pots

Q: What’s the difference between a “medium” slag pot and a “large” one?
A: It’s not just size. Medium pots are designed for moderate cycle frequency (10–15/day) and general purpose use. Large pots (60+ t) are built for integrated mills with slower cycles but higher creep resistance. We have separate design rules for each category.

Q: Can I use a medium slag pot for BOF slag?
A: Yes, for BOF converters up to 120 tons. However, BOF slag is less sticky but more chemically aggressive. We recommend ZG310-570 or GS-20Mn5 for longer life.

Q: How do you prevent trunnion damage during transport?
A: We fit removable steel caps over trunnions and secure the pot with chain lashing directly on the body – never on the trunnions. Detailed lifting & shipping instructions included.

Q: Do you offer coating for very sticky slag (e.g., high-MgO)?
A: Yes – we have a ceramicimpregnated epoxy coating that withstands 1,200°C. It is applied 2mm thick and lasts 8–12 months. Recoating can be done onsite.

Q: What is your warranty for medium slag pots?
A: 24 months / 5,000 cycles, whichever comes first. This covers cracking through the wall and trunnion failure. Wear of coating, mechanical abuse, and improper use are excluded.

Q: Can you supply slag pots without machining (ascast inner surface)?
A: We strongly advise against it. Machining is essential for slag release. However, if you accept higher cleaning costs, we can supply ascast with a price reduction of ~12%.

Q: How do I store medium slag pots when not in use?
A: Store on wooden planks, not directly on ground. Keep them covered to avoid raincooling of one spot. Rotate pots in service to distribute thermal stress.

Q: What is the typical lead time for a medium slag pot order?
A: For standard capacities (20, 30, 40, 50 tons) with ZG270-500 or ZG310-570, lead time is 35–45 days. For special materials or impact testing, add 10–15 days.