Alloy Steel Sow Mold — Material Options and Custom Configurations for Aluminium Casthouses

SMI alloy steel sow molds are reusable cast steel moulds used to cast molten aluminium from furnaces and transfer launders into large-format ingots — commonly referred to as sows — for downstream processing, transport or resale. SMI has been supplying sow molds and casthouse consumables to the aluminium industry for over 30 years, with active supply to primary smelters, secondary smelters and aluminium recycling operations across the Middle East, Europe, India, North America and Asia-Pacific.

Material selection is the central engineering decision in sow mold manufacture. The mold must withstand repeated thermal cycling — from ambient temperature to the temperature of molten aluminium and back — without cracking, warping or losing dimensional integrity. SMI offers sow molds in multiple material options to match the specific service conditions, production volume and operational requirements of each installation. SMI application engineers will confirm the most suitable material specification at the enquiry stage.

Material Options

8630 WCB 9 Alloy Steel

SMI’s standard recommendation for aluminium casthouse service. 8630 WCB 9 is an alloy steel specification selected for its strength, durability and suitability for continuous aluminium casting operations. This specification is SMI’s primary offering for sow molds supplied to primary and secondary smelters operating continuous casting schedules. Material certification is supplied as standard with every order.

SMI & HT Anti-Thermal Shock Proprietary Material

SMI’s anti-thermal shock material formulation — developed in-house for casthouse consumables — is available for sow mold applications where specific service conditions make it the more appropriate choice. This is the same material specification used across SMI’s full range of casthouse consumables including dross pans and press heads, with a 30-year operational record in aluminium casthouse environments across multiple continents. SMI application engineers will advise whether this formulation is the appropriate choice for your specific installation.

Customer-Specified Material

Where a customer’s engineering or procurement standards specify a particular alloy steel grade, SMI can manufacture sow molds to that specification. Material certification and mechanical test data are supplied as standard with customer-specified material orders. SMI application engineers will confirm suitability for the intended service conditions before order placement.

Design Features

Fully Cast Fork Pockets

Fork pockets are fully cast into the mold body — not fabricated or welded on afterward. Cast-in fork pockets are integral to the structural integrity of the mold and eliminate the failure mode associated with welded attachments under repeated thermal cycling and mechanical handling loads. Fork pocket dimensions are sized to standard casthouse forklift specifications, or to customer-specified fork dimensions.

Cast Feet and Lugs

Cast feet provide stable, level seating for the mold during casting and cooling. Cast lugs allow safe lifting and repositioning by overhead crane where required. Both features are cast integrally into the mold body in the same pour — no secondary fabrication, no weld points, no differential thermal expansion between attached components and the mold body.

Internal Profile and Surface Finish

Sow mold internal geometry and surface profile are designed to allow clean release of the solidified aluminium sow without sticking or mechanical damage to either the sow surface or the mold interior. Internal surface finish and draft angle are specified to the casting requirements of each application.

Custom Dimensions and Configurations

SMI supplies sow molds in a range of standard sizes and in custom configurations matched to specific furnace output volumes, launder dimensions and downstream handling requirements. Custom options include modified fork pocket positions, additional lugs, logo casting and application-specific geometry. All custom configurations are confirmed by SMI application engineers before manufacture.

Specifications

Application Sectors

• Primary aluminium smelters
• Secondary aluminium smelters and refineries
• Aluminium rod, billet and bar plants
• Metal recycling and non-ferrous scrap processing plants
• Aluminium die casting and foundry operations
• Aluminium refineries and remelting operations

Global Supply

SMI alloy steel sow molds are in active service at aluminium casthouses across the Middle East, Europe, India, North America and Asia-Pacific, including multiple operations within the world’s highest-output primary aluminium production groups. All supply relationships are subject to confidentiality agreements. Reference accounts are available to qualified buyers under appropriate confidentiality terms.

Related Products — SMI Casthouse Consumables

• Dross Skim Pans and Sow Molds — matched pan-and-head sets, alloy steel
• Alloy Steel Ingot Molds, Sow Molds and Dross Pans for Aluminium Scrap Recycling
• Dross Press Cooling Head — SMI & HT anti-thermal shock material, all geometries
• Aluminum Dross Press — complete dross press systems
• Dross Pans — alloy steel, matched to press head geometry
• Slag Bins and Skim Pots — available from SMI (page link to be added)

Request a Quotation

To specify the correct sow mold configuration for your operation, please provide the following at enquiry stage:

• Required sow capacity — weight per sow in kg or lb
• Fork pocket dimensions — fork width and spacing to match your forklift
• Material preference — 8630 WCB 9, SMI & HT anti-thermal shock, or customer-specified grade
• Annual consumption volume — number of molds per year
• Custom requirements — logo, modified geometry, additional lugs or other options
• Operation type — primary smelter / secondary smelter / recycling plant

SMI will respond with a written technical recommendation and commercial proposal. Contact SMI — Alloy Steel Sow Mold Enquiry →