EN 10269 Grade X15CrMo5-1 (1.7739) Bolts, Studs, Nuts Manufacturer

EN 10269 Grade X15CrMo5-1 (1.7739) Fasteners

Martensitic Chromium-Molybdenum Alloy Steel Bolts, Stud Bolts, Screws, Nuts & Washers in EN 10269 Grade X15CrMo5-1 (1.7739)

EN 10269 Grade X15CrMo5-1 (1.7739) Fasteners are martensitic chromium-molybdenum alloy steel fasteners with good resistance to oxidation and scaling at high temperatures, used in high-temperature bolting for refinery furnaces, cracking units, and petrochemical pressure equipment.

EN 10269 X15CrMo5-1 Chemical composition

Material designation	Chemical composition, % by mass
X15CrMo5-1	1.7390	≤ 0,18	≤ 0,40	0,30 to 0,80	0.025	0.015	-	-	4,0 to 6,0	0,45 to 0,65	-	-	-
a Elements not listed in this table may not be intentionally added to the steel without the agreement of the purchaser except for finishing the cast. All appropriate precautions are to be taken to avoid the addition of such elements from scrap and other materials used in production which would impair mechanical properties and the usefulness of the steel. b A controlled sulphur content of 0,015 % to 0,030 % improves the machinability and is therefore recommended and may be agreed at time of enquiry and order. For weldability, a controlled sulphur content of 0,008 % to 0,030 % is recommended and may be agreed at time of enquiry and order. c For requirements regarding magnetic properties up to a maximum of 0,28 % C.

Material designation

Chemical composition, % by mass

Name

Number

P max.

S max.

Al tot

Others

Steels for quenching and tempering

X15CrMo5-1

1.7390

≤ 0,18

≤ 0,40

0,30 to 0,80

0.025

0.015

4,0 to 6,0

0,45 to 0,65

a Elements not listed in this table may not be intentionally added to the steel without the agreement of the purchaser except for finishing the cast. All appropriate precautions are to be taken to avoid the addition of such elements from scrap and other materials used in production which would impair mechanical properties and the usefulness of the steel.
b A controlled sulphur content of 0,015 % to 0,030 % improves the machinability and is therefore recommended and may be agreed at time of enquiry and order. For weldability, a controlled sulphur content of 0,008 % to 0,030 % is recommended and may be agreed at time of enquiry and order.
c For requirements regarding magnetic properties up to a maximum of 0,28 % C.

EN 10269 X15CrMo5-1 Mechanical properties

EN 10269 X15CrMo5-1 Proof strength

Minimum 0,2 %-proof strength values at elevated temperature of steels in delivery conditions which support the Essential Safety Requirements of Directive 97/23/EC d

Material designation	Heat treatment condition^a	Diameter e d mm	Minimum 0,2 %-proof strength Rp0, 2 in MPa at a temperature (in °C) of:
X15CrMo5-1	1.7390	+NT or +QT	d ≤ 160	392*)	345	335	327	323	322	316	306	285	256	-	-	-
a +AT = solution annealed; +C = cold work hardened; +N = normalized; +NT = normalized and tempered; +P = precipitation hardened; +QT = quenched and tempered; +WW = warm worked (see Annex B). b This steel grade is generally not applied in the creep range. c Values in brackets signify that the steel is not intended for use (and testing) at those temperatures. d Products made to these steel grades and these final heat treatment conditions support the Essential Safety Requirements of Directive 97/23/EC; see Annex 1, 7.5 of this directive. e For rectangular cross sections "d" will be replaced by "b" (see Figure 1). *) Values calculated by linear interpolation.

Material designation

Heat treatment condition^a

Diameter e d mm

Minimum 0,2 %-proof strength Rp0,
2 in MPa at a temperature (in °C) of:

Name

Number

100

150

200

250

300

350

400

450

500

550

600

650

X15CrMo5-1

1.7390

+NT or +QT

d ≤ 160

392*)

345

335

327

323

322

316

306

285

256

a +AT = solution annealed; +C = cold work hardened; +N = normalized; +NT = normalized and tempered; +P = precipitation hardened; +QT = quenched and tempered; +WW = warm worked (see Annex B).
b This steel grade is generally not applied in the creep range.
c Values in brackets signify that the steel is not intended for use (and testing) at those temperatures.
d Products made to these steel grades and these final heat treatment conditions support the Essential Safety Requirements of Directive 97/23/EC; see Annex 1, 7.5 of this directive.
e For rectangular cross sections "d" will be replaced by "b" (see Figure 1).
*) Values calculated by linear interpolation.

Specifications

Surface Treatments

Xylan 1070 / 1014 / 1400 / 1424

Xylar 2 / 101

Geomet 321 / 500 / 720

SermaGard 1105 / 1280

Dacromet 320 / 500

TakeCoat 1000 Ceramic

Delta Tone/Seal

Magnigard

MolyKote

Sherardized

Zinc-Cobalt (ASTM B840)

Zinc-Nickel (ASTM B841)

Certifications

ISO 9001 - 2015 Certified
PED 2014/68/EC
NACE MR0175/ISO 15156-2
NORSOK M-650
DFAR
MERKBLATT AD 2000 W2/W7/W10