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Alloy Steel dealers in UAE

EN26 / 826M40 / 30CrNiMo8 / 1.6580

EN26 / 826M40 / 30CrNiMo8 (1.6580) — high-alloy NiCrMo steel for very large sections. Reliable Q&T through-hardening to 200-250 mm diameter. Higher Ni (2.50-3.00%) and Cr (0.90-1.20%) than 4340/EN24, giving superior hardenability for heavy forgings, large shafts, and pressure vessel components where 4340 hardenability is insufficient.

Industries Served

Oil & Gas
Power Generation
Heavy Engineering
Aerospace & Defense
Mining

Applications

  • Large-diameter oil & gas downhole tool mandrels, heavy drill collar blanks, and BHA components in sections exceeding 150 mm diameter where 4340 hardenability is insufficient
  • Heavy-duty forged crankshafts, large marine propulsion shafts, and power generation turbine shafts requiring consistent Q&T properties across 200-300 mm section diameters
  • Large press and forging machine eccentric shafts, main drive shafts, and heavy press ram components requiring uniform through-section hardness
  • Nuclear and power generation pressure vessel bolting, large-diameter studs, and heavy flange bolts requiring certified high-tensile properties in large sections
  • Mining industry gyratory crusher mainshafts, large eccentric shafts, and heavy mining machinery drive components
  • Offshore structure pin connections, large-diameter clevis pins, and structural fasteners in thick-section offshore fabrications
  • Large-diameter hydraulic and pneumatic cylinder rods and barrels for heavy industrial press and lifting equipment
  • Heavy engineering gearbox shafts, large gear blanks, and ring gears in sections above 150 mm requiring consistent core hardenability
  • Defence and military ordnance components, large-calibre gun components, and heavy military vehicle drivetrain shafts
  • Large forged valve and pump bodies, pressure-retaining components, and reactor pressure vessel internals where 4340 through-hardening is marginal

Chemical Composition

0.4 %
C

Carbon

0.36 – 0.44 %

0.25 %
Si

Silicon

0.1 – 0.35 %

0.55 %
Mn

Manganese

0.45 – 0.7 %

P

Phosphorus

≤ 0.035 %

S

Sulphur

≤ 0.04 %

2.75 %
Ni

Nickel

2.5 – 3 %

1.05 %
Cr

Chromium

0.9 – 1.2 %

0.55 %
Mo

Molybdenum

0.45 – 0.65 %

Typical value Range (min–max) Minimum (≥) Maximum (≤) Hover / tap for notes

Standard

BS 970 Part 3 - current edition

Available Forms

Round Bar

Diameter 25-500 mm. Hot-rolled or forged bar, Q&T or normalised, per BS 970 Part 3 / EN ISO 683-2. EN26 is a large-section grade - primary stock range 100-300 mm diameter. Smaller diameters available but 4340 or 4140 are normally preferred for economy. Contact Nifty Alloys to confirm availability for specific diameter requirements.

Designations & Equivalents

StandardDesignationNotes
BSEN26BS 970 legacy designation.
BSEN26TBS 970 Q&T temper suffix designation.
BS826M40Formal BS 970 Part 3 designation.
DIN30CrNiMo8DIN / EN chemical name.
EN / Werkstoff1.6580Werkstoff-Nr.
UNSG98600Nearest UNS equivalent (approximate).
ISO30CrNiMo8 (1.6580)EN ISO 683-2 designation.
Common NameHigh-tensile NiCrMo large-section alloy steelCommon description.

Compliance & Certification

StandardStatusNotes
EN 10204 3.1SuitableMill Test Certificate - standard with all supply.
EN 10204 3.2ConditionalIndependent third-party MTC - available on request.
NACE MR0175 / ISO 15156Requires ConfirmationEN26 Q&T acceptable below 22 HRC (248 HB). Standard Q&T (24-32 HRC) typically exceeds the NACE limit. Specify 22 HRC max at order stage and confirm on MTC for sour service.

Specifications

Mechanical Properties

Values are minimums unless noted; hardness is a maximum.

PropertyEN26 / 826M40 / 30CrNiMo8 / 1.6580 — BS 970 Part 3 — Quenched & Tempered (Q&T)DefaultEN26 / 826M40 / 30CrNiMo8 / 1.6580 — BS 970 Part 3 — Normalised
Tensile Strength (UTS)range850–1000 MPaTypical: 925 MPaCondition: Room temp, sections to 150 mmNotes: Per BS 970 Part 3 Q&T. Remains more consistent in sections 150-250 mm than 4340.930–1100 MPaTypical: 1015 MPaCondition: Room tempNotes: EN26 normalises to very high strength - hardness almost as high as some lower-alloy grades Q&T.
Yield Strength (0.2% Proof Stress)range700–850 MPaTypical: 775 MPaCondition: Room temp650–800 MPaTypical: 725 MPaCondition: Room temp
Elongationmin14 %Typical: 17 %Condition: 50 mm gauge10 %Typical: 14 %Condition: 50 mm gauge
Reduction of Areamin45 %Typical: 55 %Condition: Longitudinal30 %Typical: 45 %Condition: Longitudinal
Hardnessrange24–32 HRCTypical: 28 HRCCondition: Surface, Rockwell CNotes: NACE limit: 22 HRC. Standard Q&T upper range exceeds NACE limit.280–350 HBTypical: 315 HBCondition: BrinellNotes: Very hard normalised condition due to high hardenability - harder than normalised 4340.
Impact Energy (Charpy)max81 JCondition: Room temp, V-notchNotes: Higher than 4340 at equivalent hardness due to elevated Ni.27 JCondition: Room tempNotes: Low - do not use normalised EN26 in service. Must Q&T.

Physical Properties

PropertyEN26 / 826M40 / 30CrNiMo8 / 1.6580 — BS 970 Part 3 — Quenched & Tempered (Q&T)DefaultEN26 / 826M40 / 30CrNiMo8 / 1.6580 — BS 970 Part 3 — Normalised
Density20 degrees C7.85 g/cm37.85 g/cm3
Modulus of Elasticity25 degrees C210 GPa210 GPa
Thermal Conductivity100 degrees C35 W/m.K35 W/m.K
Coefficient of Thermal Expansion20-100 degrees C12.5 um/m.degC12.5 um/m.degC
Specific Heat Capacity20 degrees C475 J/kg.K475 J/kg.K
Melting Point / RangeSolidus1400 degrees C1400 degrees C
ENGINEERING NOTES
Weldability
Poor

EN26 / 826M40 has poor weldability in the Q&T condition due to its high alloy content and carbon equivalent (CE approximately 0.90-1.10). Welding Q&T EN26 components is strongly discouraged - the HAZ will not respond uniformly to re-tempering without full re-heat treatment of the entire component. In annealed condition: preheat mandatory (250-350 degrees C), low-hydrogen consumables (E9018 or higher), PWHT at 600-650 degrees C mandatory. Full re-Q&T after welding is required to restore mechanical properties in critical applications. EN26 is more challenging to weld than 4340 due to higher alloy content - consult a welding engineer before any welding operation on EN26 components. Recommended filler metals (annealed condition only): SMAW E9018-D1 or E10018-D2; MIG ER100S-2 or ER110S-1 - both require 250-350 degrees C preheat and 600-650 degrees C PWHT, with full re-Q&T for critical applications.

Machinability
Fair

EN26 machines similarly to 4340 at equivalent hardness. In Q&T condition (24-32 HRC), carbide tooling essential, reduced cutting speeds vs normalised condition. In annealed or normalised condition, HSS may be used with care - carbide tooling preferred. Machinability approximately 50-55% of AISI 1212 free-machining steel at Q&T hardness. The higher Ni content vs 4340 does not significantly change machining behaviour at equivalent hardness.

Overview

EN26 (BS 970 826M40, DIN 30CrNiMo8, Werkstoff 1.6580) is a high-alloy nickel-chromium-molybdenum steel engineered specifically for reliable through-hardening in very large sections. It contains 2.50-3.00% nickel, 0.90-1.20% chromium, and 0.45-0.65% molybdenum - significantly higher alloy content than AISI 4340 / EN24 (1.65-2.00% Ni, 0.70-0.90% Cr, 0.20-0.30% Mo). This elevated alloy content produces outstanding hardenability: EN26 will reliably through-harden in sections up to 200-250 mm diameter in oil quench, compared to approximately 150 mm for 4340. In the Q&T condition at standard engineering tempers, EN26 achieves UTS of 850-1000 MPa with good toughness across the full cross-section of large-diameter bar and forgings. EN26 is specified for the most demanding large-section applications in heavy engineering, oil & gas, and power generation where consistent through-section mechanical properties are essential and the hardenability of 4340 or lower-alloy grades cannot be guaranteed across the full section.

Nifty Alloys supplies EN26 / 826M40 / 30CrNiMo8 in round bar from stock and to order from Dubai, UAE. As a high-alloy specialist grade, EN26 is held in a more limited size range than 4140 or 4340 - contact our technical team to confirm current stock availability and lead times before ordering. All material is supplied with EN 10204 3.1 Mill Test Certificates as standard, confirming chemical composition, mechanical properties, and full traceability. EN 10204 3.2 third-party inspection is available on request. We deliver across the UAE within 24-48 hours for in-stock sizes and export to Saudi Arabia, Kuwait, Qatar, Oman, and Bahrain. Contact our team for same-day quotation.

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EN26 / 826M40 (DIN 30CrNiMo8, Werkstoff 1.6580) is a high-alloy NiCrMo steel specified for very large-section applications where reliable through-hardening beyond the capability of 4340/EN24 is required. Key applications include: large-diameter oil & gas downhole tool mandrels and BHA blanks (sections above 150 mm); heavy forged crankshafts and marine propulsion shafts; power generation turbine shafts and large press machine drive shafts; nuclear and power generation pressure vessel bolting in large diameters; mining gyratory crusher mainshafts; large hydraulic cylinder rods and barrels; heavy-duty gearbox shafts in sections above 150 mm; and defence ordnance and large military vehicle drivetrain components. EN26 is specified when a designer requires the mechanical properties of a 4340-class alloy steel consistently through sections of 150-250 mm diameter - a requirement 4340 cannot reliably meet.

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