Mill Housing for Rolling Mills | Basic Metal Manufacturing Component

Product Specifications

Technical details and manufacturing context for Mill Housing

Definition

In a heavy-duty rolling mill stand, the mill housing is the massive, rigid structural frame, typically made of cast steel or forged steel. It houses and supports the work rolls, backup rolls, roll bearings, screwdown mechanisms, and other critical components. Its primary function is to absorb and withstand the immense vertical and horizontal forces generated during the metal rolling process, ensuring precise alignment and stability of the entire roll assembly under extreme loads. It provides the foundational rigidity necessary for maintaining tight tolerances and product quality in metal forming operations.

The mill housing is a passive, load-bearing structure. It does not move but provides a fixed, ultra-rigid enclosure. During rolling, forces from the metal deformation are transmitted through the work rolls and backup rolls into their bearings, which are seated in the housing's windows. The housing's design (often a closed or open-top frame) distributes these massive tensile, compressive, and bending stresses throughout its robust cross-section, preventing deflection and maintaining the critical gap (roll gap) between the work rolls. Its stability is fundamental to the mill's geometric accuracy and operational safety.

Typical parameters for medium mills include a rated rolling force of 500–2000 kN, a frame section modulus of 5000–15000 cm³, elastic deformation of 0.1–0.5 mm, and an operating temperature range of -20 to 80 °C. The material grade ZG270-500 (per GB/T 11352) is commonly specified for cast steel. Surface hardness is typically 160–220 HBW, and machining tolerance is ±0.05 mm (ISO 2768-mK). The housing weight ranges from 5 to 30 tonnes, with a typical footprint of 2000×1500×2500 mm. These values are reference ranges; verify model-specific data with the manufacturer or supplier.

Working Principle

The mill housing operates as a passive, load-bearing structure. It does not move but provides a fixed, ultra-rigid enclosure. During rolling, forces from the metal deformation are transmitted through the work rolls and backup rolls into their bearings, which are seated in the housing's windows. The housing's design (often a closed or open-top frame) distributes these massive tensile, compressive, and bending stresses throughout its robust cross-section, preventing deflection and maintaining the critical gap (roll gap) between the work rolls. Its stability is fundamental to the mill's geometric accuracy and operational safety.

Common Materials

Cast Steel, Forged Steel

Technical Parameters

Parameter	Typical range	Notes & selection driver
Rated Rolling Force	500–2000 kN	Determines maximum strip reduction capability.
Frame Section Modulus	5000–15000 cm³	Higher values reduce deflection under load.
Elastic Deformation	0.1–0.5 mm	Affects strip thickness accuracy.
Material Grade	ZG270-500	Cast steel with high strength and toughness.GB/T 11352
Operating Temperature	-20–80 °C	Beyond this range, material properties degrade.
Surface Hardness	160–220 HBW	Ensures wear resistance in guideways.
Machining Tolerance	±0.05 mm	Critical for bearing seat alignment.ISO 2768-mK
Weight	5–30 t	Affects foundation and crane requirements.
Footprint (L×W×H)	2000×1500×2500 mm	Typical maximum envelope for medium mills.

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Top Cap Part
Connects the two housing posts at the top, completing the closed frame structure to enhance rigidity.

Material: Cast Steel
Housing Post Part
The two primary vertical columns that form the sides of the window and bear the main rolling load.

Material: Cast Steel
Base / Sole Plate Part
The bottom section that mounts to the mill foundation, providing stability and load distribution.

Material: Cast Steel
Window Liner / Wear Plate Part
Hardened plates installed on the inner faces of the housing posts to protect against wear from roll chocks.

Material: Hardened Alloy Steel

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Roughing Mill Stands

View system integration details

Manufacturers of Mill Housing

2 companies list this product among what they make. Company figures are quoted from each company's own website; every card states where the relationship came from.

Anshan Metal Co., Ltd.

Liaoning, CN

Also makes: Continuous Casting Machine, Transmission, Magnetic Separator and 1 more

Listed on the company's own website · profile compiled by CNFX from public sources

Listed there as: “Rolling Mill Housing”
View source page ↗ asmetal-china.com · checked 2026-09-05

View profile Send enquiry

Henan Xintengfei Cast Steel Co., Ltd.

Henan, CN

Also makes: Bearing/Housing, Ceramic Tile Press

Listed on the company's own website · profile compiled by CNFX from public sources

Listed there as: “Rolling Mill Housing”
View source page ↗ tenfaye.com · checked 2026-09-05

View profile Send enquiry

Manufacturer listings support early research and capability understanding. They are not certification, ranking, or transaction guarantees.

Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review · Page last updated 16 September 2026

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Frequently Asked Questions

What is the primary function of a mill housing?

The mill housing is the main structural frame of a rolling mill stand. It supports all other components, such as work rolls, backup rolls, and bearings, and withstands the immense forces generated during metal rolling to maintain alignment and stability.

What materials are commonly used for mill housings?

Mill housings are typically made of cast steel or forged steel. A common material grade is ZG270-500, as specified in GB/T 11352, which offers high strength and toughness.

What parameters should be verified when selecting a mill housing?

Key parameters include rated rolling force (500–2000 kN), frame section modulus (5000–15000 cm³), elastic deformation (0.1–0.5 mm), operating temperature (-20 to 80 °C), surface hardness (160–220 HBW), machining tolerance (±0.05 mm), weight (5–30 t), and footprint (2000×1500×2500 mm). Always confirm these values with the manufacturer for your specific application.

How does the mill housing affect product quality?

The housing's rigidity prevents deflection under load, maintaining the precise roll gap. This directly influences strip thickness accuracy and overall product quality. Elastic deformation of 0.1–0.5 mm is typical, but lower values are preferred for tighter tolerances.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Buyer enquiry

Request manufacturing insight for Mill Housing

Ask for use case, specification boundaries, supplier type, and RFQ preparation information for this product.

Where it goes: Straight to the CNFX editorial desk, and to the manufacturer if this product is linked to a claimed profile. Nothing is broadcast to a supplier list.
Your details stay here: We do not sell or rent enquiry data, and we do not add you to a mailing list. Used only to answer this request.
No commission, no middleman: CNFX is a directory. We take no cut of any order and never negotiate on a supplier's behalf.
What we don't claim: A listing is not an endorsement. Qualify every supplier and verify every figure yourself before ordering.

pressure:	Up to 100 MPa static, 150 MPa peak dynamic
other spec:	Max rolling force: 50 MN, Vibration tolerance: 0.5 mm/s RMS, Fatigue cycles: 10^7 at design load
temperature:	Ambient to 150°C (operating), -20°C to 200°C (material limits)

Mill Housing

Product Specifications

Applied To / Applications

Industrial Ecosystem & Supply Chain Structure

Application Fit & Sizing Matrix

Reliability & Engineering Risk Analysis

Compliance & Manufacturing Standards