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X6NiCrTiMoVB25-15-2 Special Fastener
QS Fastener: X6NiCrTiMoVB25-15-2 Special Fastener
Name: X6NiCrTiMoVB25-15-2 Special Fastener
Standard: EN10269
Material: X6NiCrTiMoVB25-15-2
Size: 1-7/8 inch
Lenght: 420 mm
Temperature: 650-700℃
Surface: Natural color
Standard: EN10269
Material: X6NiCrTiMoVB25-15-2
Size: 1-7/8 inch
Lenght: 420 mm
Temperature: 650-700℃
Surface: Natural color
Quantity
X6NiCrTiMoVB25-15-2 Special Fastener, EN10269 certified, 1-7/8"× 420 mm, long-term service at 650–700 °C, as-delivered surface finish, first choice for nuclear power and gas turbines.
What are the drawbacks or precautions for X6NiCrTiMoVB25-15-2 Special Fastener?
X6NiCrTiMoVB25-15-2 Special Fastener (1.4980) is virtually “the strongest stainless steel available” between 650 °C and 700 °C, yet the closer you push it to its ceiling, the more you must watch its Achilles’ heels. These points are both its weaknesses and the items that must be rigorously controlled on site:
1. Stress-corrosion sensitivity
In high-temperature environments containing Cl⁻, S²⁻ or oxygen-bearing steam, plus tensile stress, X6NiCrTiMoVB25-15-2 Special Fastener can still develop stress-corrosion cracks (SCC).
Countermeasures: cut installation torque by 10–15 %, use MoS₂ or Ni-based anti-seize, avoid assembling together with galvanized/cadmium-plated parts; if necessary give X6NiCrTiMoVB25-15-2 Special Fastener a stress-relief temper at 200 °C for 4 h.
In high-temperature environments containing Cl⁻, S²⁻ or oxygen-bearing steam, plus tensile stress, X6NiCrTiMoVB25-15-2 Special Fastener can still develop stress-corrosion cracks (SCC).
Countermeasures: cut installation torque by 10–15 %, use MoS₂ or Ni-based anti-seize, avoid assembling together with galvanized/cadmium-plated parts; if necessary give X6NiCrTiMoVB25-15-2 Special Fastener a stress-relief temper at 200 °C for 4 h.
2. Notch sensitivity + hydrogen-embrittlement risk
After precipitation hardening (35–40 HRC) the thread roots, cross-holes or keyways of X6NiCrTiMoVB25-15-2 Special Fastener are extremely notch-sensitive; pickling, plating or high-temperature humidity can introduce hydrogen and cause delayed hydrogen cracking.
After precipitation hardening (35–40 HRC) the thread roots, cross-holes or keyways of X6NiCrTiMoVB25-15-2 Special Fastener are extremely notch-sensitive; pickling, plating or high-temperature humidity can introduce hydrogen and cause delayed hydrogen cracking.
Countermeasures: plating is forbidden; apply low-intensity glass-bead peening (≤ 0.15 mmA) to induce compressive stress; if a surface finish is mandatory choose blasting + passivation or PVD.
3. Narrow heat-treatment window
The standard +AT+P (solution + ageing) cycle is the only way for X6NiCrTiMoVB25-15-2 Special Fastener to reach 900 MPa strength together with KV2 ≥ 50 J. Too low a solution temperature leaves TiC undissolved and gives low strength after ageing; too high an ageing temperature (> 730 °C) precipitates σ/χ phases on grain boundaries and halves impact values.
The standard +AT+P (solution + ageing) cycle is the only way for X6NiCrTiMoVB25-15-2 Special Fastener to reach 900 MPa strength together with KV2 ≥ 50 J. Too low a solution temperature leaves TiC undissolved and gives low strength after ageing; too high an ageing temperature (> 730 °C) precipitates σ/χ phases on grain boundaries and halves impact values.
Countermeasures: add Ø12 mm test bars from the same heat to every furnace batch and re-test tensile + impact to EN 10269; on-site repair welding of X6NiCrTiMoVB25-15-2 Special Fastener above 650 °C is banned unless the whole part is re-solution-treated.
4. Work-hardening + high tooling cost
High Ni-Cr content raises machining loads by ~40 % compared with 316L when drilling or tapping, cutting-tool life is halved, and residual tensile stresses left on the surface lower fatigue performance.
High Ni-Cr content raises machining loads by ~40 % compared with 316L when drilling or tapping, cutting-tool life is halved, and residual tensile stresses left on the surface lower fatigue performance.
Countermeasures: use coated carbide tools (TiAlN/TiSiN) at low speed/high feed; form critical threads by rolling to gain 30 % fatigue life and eliminate cutting-notch defects.
5. Long lead time & high price
With 25 %Ni, 2–3 %Mo and micro-alloying additions of V and B, raw-material cost for X6NiCrTiMoVB25-15-2 Special Fastener is 4–5× that of 316L; only a handful of mills worldwide can roll high-temperature bar ≥ Ø50 mm, so 12–16 week deliveries are normal.
With 25 %Ni, 2–3 %Mo and micro-alloying additions of V and B, raw-material cost for X6NiCrTiMoVB25-15-2 Special Fastener is 4–5× that of 316L; only a handful of mills worldwide can roll high-temperature bar ≥ Ø50 mm, so 12–16 week deliveries are normal.
Countermeasures: lock in a long-term order at project kick-off to avoid spot-price spikes; keep the size range within EN 10269 preferred diameters (M12–M36) during design review to minimise non-standard sizes.
6. Weldability—“weldable but fussy”
TIG/EBW can be used, but the HAZ readily precipitates carbides; when X6NiCrTiMoVB25-15-2 Special Fastener is used above 650 °C after welding its hot-strength factor drops ~20 %. In addition, the weld metal differs in composition from the base metal, the thermal-expansion mismatch promotes cracking at the fusion line under thermal cycling.
TIG/EBW can be used, but the HAZ readily precipitates carbides; when X6NiCrTiMoVB25-15-2 Special Fastener is used above 650 °C after welding its hot-strength factor drops ~20 %. In addition, the weld metal differs in composition from the base metal, the thermal-expansion mismatch promotes cracking at the fusion line under thermal cycling.
Countermeasures: avoid welding whenever possible; if essential use matching 1.4980 filler, post-weld solution-treat 980 °C/1 h + age 720 °C/16 h and inspect X6NiCrTiMoVB25-15-2 Special Fastener 100 % PT + RT.
7. Creep life falls steeply above 650 °C
EN 10269 nominal upper limit is 650 °C; short-term overheating to 700 °C lowers the 1 000 h rupture strength of X6NiCrTiMoVB25-15-2 Special Fastener by ~35 %, and long-term running bolts can fail by “necking”.
EN 10269 nominal upper limit is 650 °C; short-term overheating to 700 °C lowers the 1 000 h rupture strength of X6NiCrTiMoVB25-15-2 Special Fastener by ~35 %, and long-term running bolts can fail by “necking”.
Countermeasures: design margin—use 0.6 Rm at 650 °C as allowable stress; keep continuous operating temperature below 630 °C, replace the whole batch immediately after an over-temperature alarm.
One-sentence summary:
X6NiCrTiMoVB25-15-2 Special Fastener is “high-temperature capable but high-maintenance”; stay clear of the four minefields—SCC, hydrogen embrittlement, heat-treatment slip-ups and over-temperature—and it will run safely for tens of thousands of hours at 650 °C.
X6NiCrTiMoVB25-15-2 Special Fastener is “high-temperature capable but high-maintenance”; stay clear of the four minefields—SCC, hydrogen embrittlement, heat-treatment slip-ups and over-temperature—and it will run safely for tens of thousands of hours at 650 °C.
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