Alleima® 8R40 Billets

Datasheet updated

2022-06-29 14:00
(supersedes all previous editions)

Alleima® 8R40 is an austenitic, niobium-stabilized stainless chromium-nickel steel for use at temperatures up to 850°C (1560°F).

Standards

  • ASTM: 347, 347H
  • UNS: S34700, S34709
  • EN Number: 1.4550
  • EN Name: X6CrNiMo18-10
  • W.Nr.: 1.4550
  • SS: 2338

Product standards

  • EN 10088-3
  • ASTM A-314

Suitable for production of flanges etc. according to ASTM A-182 Grade F347/347H.

Certificates

Status according to EN 10 204 3.1

Chemical composition (nominal) %

C
Si Mn P
S
Cr Ni Mo Others
0.06 0.6 1.7 ≤0.030 ≤0.015 17.5 11 - Nb>10xC

Forms of supply

Sizes and tolerances

Round-cornered square, as well as round billets, are produced in a wide range of sizes according to the following tables. Larger sizes offered on request.

Surface conditions

Square billets

Unground, spot ground or fully ground condition.

Round billets

Peel turned or black condition.

Square billets
Size Tolerance Length
mm mm m
80 +/-2 4 - 6.3
100, 114, 126, 140, 150 +/-3 4 - 6.3
160, 180, 195, 200 +/-4 4 - 6.3
>200 - 350 +/-5 3 - 5.3

Sizes and tolerances apply to the rolled/forged condition.

Peel turned round billets
Size Tolerance Length
mm mm m
75 - 200 (5 mm interval) +/-1 max 10
>200 - 450 +/-3 3 - 8
Unground round billets
Size Tolerance Length
mm mm m
77 - 112 (5 mm interval) +/-2 max 10
124, 134 +/-2 max 10
127, 147, 157 +/-2 max 10
142, 152, 163 +/-2 max 10
168, 178, 188 +/-2 max 10
183, 193 +/-2 max 10

Other products

  • Hollow bar

Mechanical properties

Testing is performed on separately solution annealed and quenched test piece. The following figures apply to material in the solution annealed and quenched condition.

At 20°C (68°F)

Metric units
Proof strength Tensile strength Elong. Contr. HB
Rp0.2a) Rp1.0 a) Rm Ab) Z
MPa MPa MPa % %
≥210 ≥245 515-700 ≥40 ≥50 ≤215
Imperial units
Proof strength Tensile strength Elong. Contr. HB
Rp0.2a) Rp1.0 a) Rm Ab) Z
MPa MPa MPa % %
≥30.5 ≥35.5 75-101.5 ≥40 ≥50 ≤215

1 MPa = 1 N/mm2
a) Rp0.2 and Rp1.0 correspond to 0.2% offset and 1.0% offset yield strength respectively.
b) Based on L0 = 5.65 √S0 where L0 is the original gauge length and S0 the original cross-section area.

Impact strength

Due to its austenitic microstructure, Alleima 8R40 has very good impact strength both at room temperature and at cryogenic temperatures.

At high temperatures

Metric units
Temperature Proof strength Tensile strength
Rp.02 Rp1.0 Rm
°C MPa MPa MPa
min. min. min.
100 175 205 440
200 155 185 390
300 135 167 375
400 125 156 375
500 119 149 360

Disclaimer: Recommendations are for guidance only, and the suitability of a material for a specific application can be confirmed only when we know the actual service conditions. Continuous development may necessitate changes in technical data without notice. This datasheet is only valid for Alleima materials.