Connection Head/Thread: Thread Length 40-80 mm

Component Specifications

Definition

The Connection Head/Thread is a critical interface component in stopper rod systems used in continuous casting operations. It provides the mechanical and sealing connection between the stopper rod and the flow control mechanism, enabling precise regulation of molten metal flow from the tundish to the mold. This component must withstand extreme thermal cycling, mechanical stress, and corrosive environments while maintaining dimensional stability and leak-tight performance.

Working Principle

The Connection Head/Thread operates by providing a secure mechanical interface that transmits vertical movement from the actuator to the stopper rod tip. When the actuator rotates or lifts, the threaded connection converts this motion into precise vertical displacement of the stopper rod, which regulates the nozzle opening and controls molten metal flow rate. The thread design ensures repeatable positioning and maintains alignment under thermal expansion conditions.

Materials

High-temperature alloys (typically Inconel 600/601, 310 stainless steel, or refractory materials), with hardness requirements of 30-45 HRC. Must maintain mechanical properties at 800-1200°C operating temperatures.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Thread Type	Metric fine thread (M24x1.5 to M36x2) or ACME thread
Concentricity	≤ 0.05 mm
Thread Length	40-80 mm
Maximum Torque	150-300 Nm
Surface Finish	Ra ≤ 3.2 μm
Tolerance Class	6g/6H or tighter
Operating Temperature	800-1200°C
Thermal Expansion Coefficient	Match with stopper rod material

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

Standards

ISO 965-1, DIN 13, ISO 286-2, ASTM A297

Parent Products

This component is used in the following industrial products

Stopper Rod (Stopper Rod System)

A refractory-lined rod used to control the flow of molten metal from a ladle or tundish in continuous casting operations.

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Engineering Analysis

Risks & Mitigation

Thread galling under high temperature
Thermal fatigue cracking
Misalignment causing flow control inaccuracies
Corrosion from slag/metal contact
Mechanical failure under cyclic loading

FMEA Triads

Trigger: Thermal cycling causing differential expansion
Failure: Thread seizure or binding
Mitigation: Use matched thermal expansion materials, apply high-temperature anti-seize compounds, implement controlled heating/cooling cycles

Trigger: Inadequate thread lubrication at high temperatures
Failure: Increased wear and reduced service life
Mitigation: Apply specialized high-temperature lubricants, implement regular maintenance schedules, monitor torque values during operation

Trigger: Misalignment during installation
Failure: Premature thread wear and flow control inaccuracies
Mitigation: Use alignment fixtures during installation, implement laser alignment checks, train operators on proper installation procedures

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Thread tolerance per ISO 965-1: 6g for external threads, 6H for internal threads. Concentricity tolerance ≤ 0.05 mm. Surface finish Ra ≤ 3.2 μm.

Test Method

Dimensional verification with thread gauges, thermal cycling tests (5 cycles minimum), torque testing to 150% of maximum operating torque, leak testing at operating temperature simulation

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

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Manufacturers of Connection Head/Thread

Manufacturer profiles associated with Connection Head/Thread.

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Frequently Asked Questions

What is the primary function of the Connection Head/Thread in stopper rod systems?

It provides the mechanical interface that transmits precise vertical movement from the actuator to the stopper rod tip, enabling accurate control of molten metal flow in continuous casting operations.

Why are specific thread tolerances critical for this component?

Tight tolerances (6g/6H or better) ensure precise positioning repeatability, prevent backlash in flow control, maintain alignment under thermal expansion, and ensure leak-tight performance in high-temperature environments.

What materials are typically used for Connection Head/Thread components?

High-temperature alloys like Inconel 600/601 or 310 stainless steel are common, selected for their ability to maintain mechanical properties at 800-1200°C while resisting thermal fatigue and oxidation.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

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.

Connection Head/Thread