Steel Mould For Concrete Block Making
2.Hardness for shoes:HRC59-62
3.Carburized layer thickness:1.3-1.5mm
4.Unilateral clearance between presser foot and mold cavity: 0.2 mm ≤ Unilateral clearance ≤ 0.4mm
5.Flatness of the whole board: ≤ 0.5mm
6.Deviation in length and width dimensions of a single cavity model: -0.3 to+0.3mm
7.The dimensional deviation of the height (filling depth) of the lower model cavity is ± 0.5mm
Steel Mould for Concrete Block Making
Selection Guide: How to Choose the Right Steel Mould
Selecting the appropriate steel mould is critical for ensuring efficiency, product quality, and cost control in concrete block production. Drawing on years of experience at Fujian Unik Mould Technology Co., Ltd., we recommend evaluating four key dimensions:
Block Type & Specifications
Clearly define whether you produce standard bricks, hollow blocks, paving stones, kerbs, or special custom profiles. Each block type requires specific cavity shapes, draft angles, and dimensional tolerances.
Production Volume & Expected Lifespan
The material grade and heat treatment process determine the mould's lifespan. For small batches (<50,000 cycles), high-quality carbon steel is adequate. For high-volume automated lines (>200,000 cycles), alloy tool steel with carburising or nitriding treatment is essential.
Equipment Compatibility
Confirm that the mould matches your block machine's mounting interface, vibration frequency, and demoulding mechanism. UNIK provides custom interface designs to fit all major makes (e.g., Zenit, Columbia, or local Chinese brands).
Surface Finish & Precision
A high-gloss cavity finish reduces demoulding resistance and ensures sharp edges and corners. We recommend a precision tolerance within ±0.15 mm to minimise scrap rates.

Frequently Asked Questions (FAQ)
Q1: How often should a steel mould be replaced?
A: This depends on production volume and maintenance. An alloy steel mould typically lasts 150,000–250,000 cycles. Replace or repair when you notice excessive flash, dimensional deviation, or difficult demoulding.
Q2: What is the typical lead time?
A: 25–30 working days for standard series; 40–45 days for custom or complex cavities. Expedited orders can be discussed.
Q3: Do you provide drawings and material certificates?
A: Yes. Each mould set is delivered with 2D/3D drawings, a material test report, and a heat treatment record.
Q4: Can a damaged mould be repaired locally?
A: Edge wear on cavities can be rebuilt by welding. General deformation or cracks are cause for replacement. UNIK offers paid repair evaluation services.
Q5: Does UNIK make moulds for machines from other manufacturers?
A: Yes. Please provide your machine model and interface drawing. We can reverse-engineer or optimise your original mounting plate.
Certifications & Quality Assurance
UNIK is committed to delivering compliant, reliable steel moulds. Our quality system is ISO 9001:2015 certified. Each mould is manufactured to the following standards:
- Material Traceability: Original mill certificates for each steel batch.
- Hardness Testing: Cavity surface HRC 58–62, base material HRC 28–32.
- Dimensional Inspection: CMM (Coordinate Measuring Machine) report included.
- Non-Destructive Testing: 100% magnetic particle inspection on critical welds.
Upon request, we can also provide CE declarations or other conformity documents for specific markets.

Customer Case Studies
Case 1: Large Block Plant in Riyadh, Saudi Arabia
- Requirement: Produce 40 million hollow blocks annually; mould life over 200,000 cycles.
- Solution: UNIK provided D2 steel moulds with an optimised venting groove design.
- Result: Achieved 230,000 cycles with scrap rate below 0.8%. Three repeat orders received.
Case 2: Small Pavers Manufacturer in Indonesia
- Requirement: Frequent pattern changes, low cost, and fast delivery.
- Solution: Modular 45# steel cavity inserts with hard chrome plating.
- Result: Six sets delivered in 15 days at 32% lower unit cost. Customer ordered 7 additional patterns.
Case 3: Landscape Block Supplier in Australia
- Requirement: Complex curved kerb mould with mirror-polished cavity.
- Solution: SKD11 steel, 5-axis machined and hand-polished.
- Result: Blocks demould without any release agent. Mirror-like surface finish set a new local benchmark.




Manufacturing
Market Analysis
The global concrete block mould market is driven by urbanisation in Africa and Southeast Asia, plus infrastructure renewal in North America and Europe.
Africa & Middle East: Rapid housing construction fuels demand for hollow block moulds. Price sensitivity remains high, making cost-effective, durable moulds the leading choice.
Southeast Asia: Growing road and pavement projects drive the paving stone mould segment. Quick delivery and variety of patterns are key.
North America & Europe: Focus is on custom, high-precision moulds for architectural blocks and permeable pavers. CE-compliant, eco-friendly manufacturing is a requirement.
China (Export Hub): As a leading exporter, China offers competitive pricing and flexible customisation. UNIK, based in Quanzhou, benefits from a mature supply chain and port access.
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