SteelPhalt

What SteelPhalt does

SteelPhalt, founded in 1964 and headquartered in Rotherham, South Yorkshire, develops and manufactures sustainable asphalt products for road construction, resurfacing, and maintenance using up to 95% recycled steel slag aggregate combined with polymer-modified binders and bio-binders. The company operates three manufacturing facilities, one in Rotherham (headquarters and primary plant with an on-site R&D laboratory), one in Cardiff serving South Wales, and one in Murga, Álava in Spain's Basque Country (Euskadi). Its core product portfolio comprises seven branded ranges (SteelPave, SteelSurf, SteelFlow, SteelFlex, SteelSuDS, SteelDense, SteelPatch) with Eco and Eco+ variants, supported by over 100 unique asphalt recipes and HAPAS certifications for SteelPave 14 and SteelPave 10. According to company-disclosed EPD scope A1-A3 data, SteelPhalt products can reduce the carbon footprint of roadlaying by up to 70%.

The company sells directly to UK and Spanish local authorities, councils, contractors, and commercial/industrial customers through a regional enterprise sales structure with dedicated commercial managers in Rotherham, Cardiff, and Euskadi. Pricing is project-based and quote-driven, with product specifications tailored to traffic volume, vehicle type, skid resistance, and environmental criteria. SteelPhalt is a business unit within Harsco Environmental's ecoproducts division, itself a segment of Enviri Corporation (NYSE: ENV; formerly Harsco Corporation, rebranded in 2023). Notable customer engagements include resurfacing projects with Rotherham Metropolitan Borough Council, a 1,000-tonne SteelFlex installation on Cardiff's A4161 Castle Street, and ultrathin SteelFlow surfacing on the Humber Bridge dual carriageway. In 2025 the company received recognition from Spain's Ministry for Ecological Transition under the PERTE program, and in 2026 it launched a verified Environmental Product Declaration (EPD) tool under the International EPD System. Revenue is not publicly disclosed; the company is funded through its parent corporation's capital structure rather than independent funding rounds.

Name

SteelPhalt

Legal name

SteelPhalt (a division of Harsco Environmental)

Website

https://steelphalt.com

Company type

Private

Founded year

1964

Operating status

Operating

Headcount range

5,001–10,000 employees

Short description

SteelPhalt, founded 1964 and headquartered in Rotherham, manufactures sustainable asphalt products using up to 95% recycled steel slag aggregate, selling directly to UK and Spanish local authorities, contractors, and industrial customers through three regional manufacturing facilities as a division of Enviri Corporation.

Ownership category

akta.pro rank

Product category

Construction Materials - Sustainable Asphalt Manufacturing

NAICS

Asphalt Paving Mixture and Block Manufacturing (324121), Asphalt Paving, Roofing, and Saturated Materials Manufacturing (32412)

SIC

Asphalt Paving & Roofing Materials (2950)

akta.pro primary industry

Asphalt Mixing & Paving Materials (Hot/Warm/Cold Mix, RAP/RAS Blends) (EUALAKAG)

akta.pro secondary industries

Asphalt Additives & Performance Enhancers (Anti-strip, Warm-mix, Fibers, Rejuvenators) (EUALAKAH), Recycled Aggregates & C&D Materials Processing (RCA, RAP, Glass Aggregate) (IMAKAHAI)

Keywords

• Sustainable asphalt manufacturing
• Steel slag aggregate
• Road construction materials
• Recycled asphalt products
• Industrial surfacing solutions

Headquarters

HQ city

Rotherham

HQ country

United Kingdom

HQ region

Europe

Offices3 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Supply Chain, Operations, Technology or R&D, Personnel, Infrastructure, Marketing or Sales

Revenue model

1. Asphalt Product Sales: Sale of proprietary steel slag asphalt products including SteelPave, SteelSurf, SteelFlow, SteelFlex, SteelSuDS, SteelDense, and SteelPatch. Products are sold directly to councils, local authorities, contractors, and industrial/commercial customers for road construction, resurfacing, and maintenance applications. Revenue is project-based, driven by infrastructure spending and road maintenance budgets.

Pricing tiers

Go-to-market motion1 record

Distribution channels2 records

Marketing channels1 record

Core offering

SteelPhalt develops and manufactures sustainable, high-performance asphalt products for road construction, resurfacing, and maintenance using up to 95% recycled steel slag aggregate combined with polymer-modified and bio-binders. The product range includes seven core formulations (SteelPave, SteelSurf, SteelFlow, SteelFlex, SteelSuDS, SteelDense, SteelPatch) available in standard, Eco, and Eco+ variants, serving councils, contractors, and commercial/industrial customers across the UK and Spain.

Product overview

SteelPhalt is a sustainable asphalt manufacturer producing high-performance asphalt products for road construction using up to 95% recycled steel slag aggregate. The product portfolio consists of seven core products: SteelPave™ (high-performance stone mastic asphalt for highways and major roads), SteelSurf™ (industrial asphalt for heavy-duty applications), SteelFlow™ (ultrathin sustainable surfacing), SteelFlex™ (stone mastic asphalt with PMB), SteelSuDS™ (porous asphalt for drainage), SteelDense™ (standard asphalt enhanced with steel slag), and SteelPatch™ (asphalt maintenance solution). All products are available in Eco and Eco+ variants, which incorporate bio-binders to further reduce carbon footprint. SteelPhalt products can reduce the carbon footprint of roadlaying by up to 70% according to EPD scope A1-A3. The company operates as a division of Harsco Environmental (Enviri) and has been developing and manufacturing asphalt products since the 1960s.

Differentiator

Problem solved

Functional benefit

Brands

• SteelPave™: High-performance stone mastic asphalt designed to meet the demands of modern traffic conditions.
• SteelSurf™
• SteelFlow™
• SteelFlex™
• SteelSuDS™
• SteelDense™
• SteelPatch™
• Eco Range

Products and services

• SteelPave High-performance stone mastic asphalt (SMA) designed for modern traffic conditions on highways and major roads. HAPAS-approved (SteelPave 14 and SteelPave 10), consisting of up to 95% recycled materials, providing durability, skid resistance, and consistent performance across high-traffic road networks. Available in Eco and Eco+ variants for enhanced sustainability.
• SteelSurf Industrial asphalt solution for heavy applications designed to resist deformation caused by heavy loading of specialized vehicles. Maintains surface stability under slow-moving scrubbing action of heavy vehicle tyres. Available in SteelSurf Drive and SteelSurf Single Layer Asphalt (SLA) variants for commercial driveways, car parks, and industrial sites. Available in Eco and Eco+ variants.
• SteelFlow Sustainable, high-performance, durable asphalt consisting of 95% steel slag aggregates combined with Polymer-Modified Binder (PMB). Can be laid ultrathin at just 15mm depth, reducing noise pollution, increasing skid resistance, and achieving 59% less asphalt usage with 46% material cost savings compared to traditional 40mm surface course.
• SteelFlex High-performance stone mastic asphalt designed with steel slag aggregate and high-performance Polymer Modified Binder (PMB). Offers high skid resistance and crack and deformation resistance. Also available as SteelFlex SAMI (Stress Absorbing Membrane Interlayer) for crack prevention, waterproofing, and stress absorption on concrete-based highways, car parks, and industrial estates.
• SteelSuDS Sustainable porous asphalt solution consisting of 95% steel slag aggregate that reduces surface water through effective drainage. Provides outstanding drainage characteristics and noise-reduction properties for sustainable drainage systems (SuDS) applications.
• SteelDense Standard asphalt enhanced with steel slag aggregate combining strength, durability, and environmental consciousness. All EN 13108-1 mixtures available with steel slag aggregate offering high skid and rutting resistance with improved fatigue resistance for residential roads and standard applications.
• SteelPatch Flexible asphalt maintenance solution using sustainable steel slag aggregate with modified additives to prolong the life of both hot and cold patch material. Available as SteelPatch Hot for pothole repairs and ramping, and SteelPatch Cold as an efficient zero-waste alternative for surface repairs.
• Eco and Eco+ Range Product range combining locally sourced recycled steel slag aggregate with bio-binders made from non-recyclable polymers that would otherwise go to landfill or be incinerated. Eco+ Range incorporates organic materials which significantly reduce the product's carbon footprint further, helping customers achieve net zero ambitions. All of SteelPhalt's core products are available in Eco and Eco+ variants.
• Verified Environmental Product Declaration (EPD) Tool Verified Environmental Product Declaration (EPD) tool under the International EPD System providing standardized, lifecycle-based environmental impact data for SteelPhalt's steel-slag asphalt products. The tool enables customers to make sustainability-informed purchasing decisions and meet voluntary or government-required reporting requirements. The EPD production process is certified and subject to annual audits.

Quantifiable outcome

• Carbon reduction of up to 70% in roadlaying (EPD scope A1-A3)
• +8 more outcomes

Named customers4 records

Segments3 records

Ideal customer profiles3 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature5 records

Partnerships

One partnership is on record.

• Harsco Environmental (ecoproducts division)flagshipStrategic or Co-development Partner · 6 May 2026SteelPhalt is a business unit and sustainable asphalt producer within Harsco Environmental's ecoproducts division. The parent company Enviri (formerly Harsco Corporation) enables SteelPhalt's operations through access to steel slag by-products from steel manufacturing, global R&D resources, and corporate infrastructure spanning multiple countries.

Scale indicators5 records

Recent moves6 records

Expansion highlights6 records

Emerging players

• MacRebur: MacRebur produces asphalt containing recycled plastic waste, targeting similar sustainability and carbon-reduction outcomes as SteelPhalt's bio-binder and recycled slag products. It is smaller and earlier stage but competes for green procurement specifications.

Regional players

• Boral Limited: Boral is an Australian-based aggregates, asphalt, and building materials group with sustainability-focused product lines. It serves a similar market need (lower-carbon road materials) but in a different geography, making it a benchmark rather than direct competitor.

Direct peers

• Breedon Group: Breedon is a vertically integrated UK and Irish aggregates and asphalt producer. Its surfacing solutions serve the same local authority and commercial segments as SteelPhalt, including lower-carbon asphalt products.
• Cemex UK: Cemex UK supplies aggregates, asphalt, and cement for roads and infrastructure. It competes with SteelPhalt for highway surfacing tenders and offers its own lower-carbon and recycled-content asphalt ranges.
• Colas (Bouygues): Colas is a global road construction and asphalt materials group with strong UK and European operations. It produces standard and sustainable asphalt mixes that compete with SteelPhalt's steel-slag-based products.
• Eurovia (Vinci): Eurovia is a major European road infrastructure and asphalt producer, including low-temperature and recycled asphalt solutions. It overlaps with SteelPhalt's UK and Iberian customer base, particularly in Spain.
• Aggregate Industries: Aggregate Industries is a major UK supplier of aggregates and asphalt serving roads, commercial, and infrastructure projects. Its SuperLow asphalt and sustainable ranges overlap directly with SteelPhalt's steel-slag asphalt portfolio.
• Hanson UK (Heidelberg Materials): Hanson UK supplies asphalt, aggregates, and cement products, including reduced-carbon asphalt lines. It competes with SteelPhalt for local authority and contractor specifications across UK road and commercial surfacing.
• Tarmac (CRH): Tarmac is the UK's largest heavy-side building materials business, producing aggregates, asphalt, cement, and ready-mixed concrete. It directly competes with SteelPhalt in UK road and infrastructure asphalt supply, including lower-carbon product lines.

Others

• Shell Bitumen: Shell Bitumen supplies asphalt binders and emulsions globally, including polymer-modified and lower-carbon binder products. It is an upstream supplier/partner to asphalt producers like SteelPhalt rather than a direct competitor.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

• Xx.com/steelphalt
• Facebookfacebook.com/profile.php
• LinkedInlinkedin.com/company/steelphalt

Compliance4 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles11 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about SteelPhalt