ASTM A516 Grade 70 Boiler Plate

Knuckle of a torispherical head in segments ID 15.200 mm x 28 mm in steel ASTM A516 Grade 70 ASME II-A, being trial-fitted for shop inspection 375 x 250

Knuckle of a torispherical head in segments ID 15.200 mm x 28 mm in steel ASTM A516 Grade 70 ASME II-A, being trial-fitted for shop inspection

ASTM A516 Grade 70 steel is one of the most popular steels for boilers, pressure vessels and heat exchangers. It is excellent at low temperature and have good results on standard Charpy V Notch toughness tests. A516 70 is according to the ASTM standard A516/A516M

We have an extensive stock of A516 Grade 70 plates of all thicknesses and dimensions – especially thicker plates – making it easy to find exactly the plates that you are looking for.

ASTM A516 Grade 70  Plates in Stock

  • Stock up to 300mm
  • Wide range of dimensions
    • 3.5m 3m, 2.5m, 2m an 1.5m wide ASTM A516 Grade 70 plates  in stock
    • Upto 12m plates with multiple length possibilities
  • MTC to EN10204 3.2
  • German Steel – Dillinger, Thyssen, Clabecq
  • Large number of plates at each thickness

With steel plates in ASTM A516 Grade 70 available up to 24 MT in weight Oakley Steel is a popular supplier to fabricators with ASME U and U2 stamps building heavy walled pressure vessels.

ASME SA516 Grade 70 Boiler Plate

It is worth mentioning that all of our A516 Grade 70 plates are actually to ASME SA516 70 as the two standards are harmonised. What actually appears on the mill certificate is SA516 70

Why Customers Buy ASTM A516 70 from Oakley Steel

There are several key reasons for buying A516 Gr 70 from Oakley Steel. These include:

  • Great Quality
  • Wide Range of Plates
  • Thick Plates

High Quality A516 70 Steel Plates

ASTM A516 Grade 70 plates are used in a large number of pressure applications covered by the ASME code and the Pressure Equipment Directive. Our focus is on customers who are using the plates for applications in the oil and the gas industry – upstream and downstream – where the technical quality of the steel is critically important.

All of our mills are approved mills for many, if not all, of the worlds major oil and gas companies. This means that the quality of the steel making has already been pre-approved. There’s a good reason for this. The pressure vessel steel plates that come from our mills – mainly Dillinger, Thyssen and NLMK Clabecq are the result of hundreds of years of steel making experience. In Dillinger’s case it is over 300 years of making steel at the same site.

Three hundred years of incremental improvements means that our plates deliver the ultra low sulphur and phosphorous that is so critical in ensuring defect free vessels and reactors. Sulphur values in SA516 70 steel are typically 70 times lower than required by the A 516/A 516M standard, whilst phosphorous is typically 30 times lower.

That’s a big deal because not only does it mean that the chance of the ASTM A516 Grade 70 plate failing a retest during production is vanishingly low, but it also means faster approval by the end user of the MTCs and a much much better end product that will over its lifetime reduce operating expenses because of its greater reliability and improved maintainability.

All of plates meet this high quality requirement. That means thousands of tonnes available for your project that can be delivered to the port in a matter of a couple of days allowing you to expedite production or help win another tender.

Don’t take our word for it though – ask for an MTC and see for yourself!

Wide Range of A516 Grade 70 Steel Plates

Steel quality brings customer’s to Oakley Steel but what keeps them coming back is that our stock of ASTM A516 Grade 70 plates is so extensive that we have what they are looking for. With thousands of tonnes of ASTM A516 Grade 70 in stock at a single location close to one of the world’s busiest ports we have the number of plates to offer a huge diversity in plate sizes and thicknesses.

As a heavy plate stockiest we don’t focus on the thin plates. So we don’t stock any plates less than 5mm thick. From 5mm (in 2055, 2500 and 3000mm by 12m) all the way up to massive 300mm plates (also available as S355 NL) we can satisfy the most demanding requirements of engineering customers building heavy reactors and massive columns.

As with our structural steel stock we are able to support customers requiring immediate delivery of several hundred tonnes of A516 70 as well as customers who require single 500kg plates.

Thick A516 Grade 70 Plates

With many stockholders reducing their steel inventory to save costs we have invested in a significant number of heavy ASTM A516 Grade 70 boiler plates. This enables us to offer a full selection of A516 Gr. 70 plates at thicknesses all the way up to 300 mm. That means that when you come to us with a requirement for say 100mm plates we have many more than just a single plate in stock. We have the full requirements of the steel RFQ in stock and it can be picked and loaded onto a truck for delivery the next day (depending on the production schedule).

The other important thing about thick plates is their quality of the steel making. Many mills are not approved by Lloyds or DNV for producing thick plates as they either don’t have the experience to consistently deliver plates to the required quality – or they don’t have the rolling mills capable of doing it.

The rolling mill at Dillingen can deliver 11,000 tonnes of force enabling it to deform the core of 400mm ASTM A516 Grade 70 slabs to produce A516 Grade 70 plates that have a consistent microstructure throughout the plate. This means far fewer defects and a significantly tougher steel even at higher thicknesses (where yield strength often drops off rapidly)

European customers can purchase  ASTM A516 Grade 70 plates from AncoferWaldram or order new rolling directly from DillingerHutte. You can purchase a copy of ASTM A516/A516M-10 from the BSI website

Other Grades Available

We also stock ASTM A516 Grade 60 with plates up to 3 metres wide for reduced welding costs and a full range of HIC resistant steel plate with thicknesses up to 100 mm

A516 70 Pressure Vessel Steel Chemical Composition

Steel GradeThicknessCSiSi (Min)MnMn (Min)PS
A516 70≥12.5 and ≤50mm0.280.450.131.30.790.0350.035
A516 70≥50 and ≤100mm0.30.450.131.30.790.0350.035
A516 70≥100 and ≤200mm0.310.450.131.30.790.0350.035
A516 70>200mm0.310.450.131.30.790.0350.035
This table provides the main features of the chemical composition of different thicknesses of A516 70 boiler plate steel as required by ASTM/ASME A516/A516M. It is not complete as we have not included many of the minor use cases. These may have a major impact in your application so please use this for reference purposes only and refer to your original and up to date copy of the relevant standard


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