400HB steel is a hard wearing steel plate with a typical Brinell hardness of around 400 HBW. The rating is used by buyers, engineers and fabricators when specifying material for parts exposed to scraping, impact, sliding contact or repeated surface wear.
This grade is also commonly known as Wear Plate 400, but the focus here is the specification itself: what the hardness rating means, what details to provide when ordering and how to check whether it is the right option for your project.
At P&D Northern Steels, we supply 400HB steel from our Oldham site, with in house cutting to size available. As an experienced steel stockist, we help customers source plate in the sizes and quantities needed for repairs, fabrication and ongoing supply.
Understanding The Hardness Rating
HB stands for Brinell Hardness. It is a recognised method of measuring how resistant a material is to indentation.
For buyers, the important point is that this steel has a harder surface than standard mild steel. That makes it useful where parts are exposed to regular scraping, rubbing or contact with demanding materials.
Hardness is important, but it should not be the only consideration. The correct choice also depends on thickness, cutting requirements, welding requirements, impact level and the conditions the plate will face in service.
Key Features Of 400HB Steel
- Hardness: The 400HB designation signifies a hardness level of approximately 400 Brinell Hardness. This helps the plate resist surface wear in demanding applications.
- Wear performance: 400HB steel is commonly used where materials scrape, slide or press against steel surfaces during regular operation.
- Impact toughness: Alongside its hardness, this grade offers useful toughness for applications where knocks, vibration or sudden impact may occur.
- Weldability: 400HB steel can be welded using suitable techniques and precautions. The correct method will depend on thickness, joint design and working conditions.
- Versatility: This grade can be used for replacement parts, protective plates, bucket liners, machinery components and material handling equipment.
- Additional requirements: If further processing or surface treatment is required, this can be discussed and, where suitable, arranged through trusted external partners.
- Project support: Documentation, traceability or testing requirements should be raised at the enquiry stage. Where additional testing is required, this can be arranged through our sister company.
When To Specify This Grade
This material is usually requested when a project needs a harder-wearing plate, but does not necessarily require the highest hardness grade available.
It may be suitable where you need:
- Plate with a typical hardness of around 400 HB
- A replacement part for worn equipment
- Steel for a machinery repair or upgrade
- A balance of hardness and toughness
- Plate that can still be cut and fabricated correctly
- Material supplied to specific dimensions
- A practical option before moving to 450HB or 500HB steel
If the application is especially severe, a higher hardness grade may be considered. If fabrication is a priority, this grade may be the more practical option. Our experienced steel stockholders can help you compare the options.
What To Include In Your Enquiry
Providing the right information at the start helps us check availability and quote more accurately.
When enquiring, please include:
- Grade required
- Plate thickness
- Length and width
- Quantity
- Whether cutting to size is needed
- Delivery postcode
- Intended use
- Any welding or fabrication requirements
- Any documentation or testing requirements
If you have a drawing, cutting list or specification, send it to our team and we will review the details.
Documentation And Testing Requirements
Some projects require documentation, traceability or additional testing. These requirements should be mentioned before ordering, so the correct support can be confirmed.
Where additional testing is required, it can be arranged through our sister company. This gives customers additional support when needed, without assuming that every plate is tested or certified as standard.
If your project has specific documentation requirements, tell us at the enquiry stage so our team can advise.
Supply From P&D Northern Steels
P&D Northern Steels has supplied steel across the UK for over 54 years. From our Oldham site, we support fabricators, engineers, contractors, manufacturers and maintenance teams with reliable steel supply and practical advice.
As experienced steel suppliers, we focus on making the process clear and straightforward. Tell us what you need, and we will help with availability, cutting options, lead times and delivery.
For projects that require heavier plate sections, we also support customers through our thick steel plate supplier service.
Contact Us For 400HB Steel
If you need this grade for repairs, replacement components, fabrication work or ongoing supply, contact P&D Northern Steels today.
Use the contact form below or call 01706 848811 to speak to our team.
Frequently Asked Questions
400HB refers to a typical Brinell hardness level of around 400. HB stands for Brinell Hardness, which measures how resistant a material is to indentation.
The terms are often used for the same type of material. One describes the hardness rating, while the other describes the material by its common use as a wear plate.
Please send the thickness, length, width, quantity, delivery postcode and any cutting requirements. If you have a drawing or cutting list, include that as well.
Yes. P&D Northern Steels offers in house cutting to size from its Oldham site.
Yes, but suitable procedures should be followed. The correct approach depends on thickness, joint design and working conditions.
No. 450HB and 500HB are harder grades. This option is often chosen when a project needs a balance of wear performance, toughness and workability.
It may be suitable where mild steel wears too quickly, but the correct choice depends on the application. If the part is structural or safety critical, the specification should be checked before ordering.
Yes. If additional testing is required, this can be discussed at enquiry stage and arranged through P&D Northern Steels’ sister company, where needed.
Cutting to size is carried out in house. Other services can be discussed and, where suitable, arranged through trusted external partners.
Yes. P&D Northern Steels supplies steel from its Oldham site, with delivery available across the UK.
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Applications:
Wear Plate -
Grades:
400HB
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Standards:
Q+T -
Contact Us Today
P&D Northern Steels are leading UK suppliers of 400HB Steel. We have supplied 400HB Steel to organisations in a variety of sectors for the last 54 years. With extensive stock levels, exceptional quality and customer service, we are experienced steel stockholders which can supply steel for a number of sectors. Please get in touch on 01706 848811 or fill in the .