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Special Alloy Double End Stud
QS Fastener: Special Alloy Double End Stud
Name: Special Alloy Double End Stud
Standard: ASME
Material: A453 Gr.660
Size: 3/4 inch
Lenght: 130 mm
Temperature: 650-700℃
Surface: Natural color
Standard: ASME
Material: A453 Gr.660
Size: 3/4 inch
Lenght: 130 mm
Temperature: 650-700℃
Surface: Natural color
Quantity
Special Alloy Double End Stud – machined from ASTM A453 Grade 660 high-temperature alloy steel and precision-forged to ASME standards; ¾ in. diameter × 130 mm long, designed for 650-700 °C service. The natural metal surface resists corrosion and oxidation, while the double-ended threads allow quick installation and lasting clamping, making it the fastener of choice for petrochemical, nuclear and gas-turbine equipment operating at high temperature and pressure.
After receiving the goods, how should we store and keep them?
“Constant-Temperature / Constant-Humidity + Knock & Contamination Protection” storage guide for Special Alloy Double End Stud (A453 Gr.660) after delivery
“Constant-Temperature / Constant-Humidity + Knock & Contamination Protection” storage guide for Special Alloy Double End Stud (A453 Gr.660) after delivery
I. First 15 min after arrival – inspect, then give an “ID card”
1. Photograph everything
Take 360° pictures (carton, moisture bag, rack, batch number). If condensation or damage is found, start the claim procedure immediately.
1. Photograph everything
Take 360° pictures (carton, moisture bag, rack, batch number). If condensation or damage is found, start the claim procedure immediately.
2. Check documents
Only when the mill test certificate (MTC), ASTM A453 Gr.660 heat-treatment curve, hardness 248-341 HBW report and PMI certificate are all consistent may Special Alloy Double End Stud be accepted.
Only when the mill test certificate (MTC), ASTM A453 Gr.660 heat-treatment curve, hardness 248-341 HBW report and PMI certificate are all consistent may Special Alloy Double End Stud be accepted.
3. Colour code + barcode
Print “660-DE-3/4-130-batch No.” on high-temperature label paper and stick it on the shank 20 mm from the thread to avoid mix-ups.
Print “660-DE-3/4-130-batch No.” on high-temperature label paper and stick it on the shank 20 mm from the thread to avoid mix-ups.
Example: during a 2023 power-plant outage a fallen label caused Special Alloy Double End Stud to be mixed with 304 studs; after 300 h the 304 bolt failed, shutting the unit down for 4.8 M CNY.
II. Short-term storage (≤30 days) – “pharmaceutical cool-room” level
Environment
15-25 °C, ≤45 %RH, recorded by hand twice daily. No pickling solutions, chloride cleaners or wooden pallets (moisture ≥12 % can mould and release organic acids) are allowed inside.
Environment
15-25 °C, ≤45 %RH, recorded by hand twice daily. No pickling solutions, chloride cleaners or wooden pallets (moisture ≥12 % can mould and release organic acids) are allowed inside.
Stacking
1. Keep the original vacuum bag + VCI paper unopened; lay Special Alloy Double End Stud flat in “V-shape nylon” racks with 5 mm silicone sheet between layers to stop the threads knocking together.
1. Keep the original vacuum bag + VCI paper unopened; lay Special Alloy Double End Stud flat in “V-shape nylon” racks with 5 mm silicone sheet between layers to stop the threads knocking together.
2. Never place directly on the floor: ground moisture can produce spotted oxidation colour on Gr.660 within 12 h – harmless but often rejected by site inspectors as “rust”.
3. Max. 3 layers, each ≤25 kg, to prevent micro deformation of the threads under their own weight.
III. Long-term storage (>30 days) – upgrade to “inert-gas + stainless dry cabinet”
1. Nitrogen seal
Put 50 pieces of Special Alloy Double End Stud into a 0.2 mm Al-PE bag, evacuate to –0.08 MPa, back-fill with 99.5 % N₂ and heat-seal; residual O₂ <0.3 % keeps them oxide-free for 3 years.
1. Nitrogen seal
Put 50 pieces of Special Alloy Double End Stud into a 0.2 mm Al-PE bag, evacuate to –0.08 MPa, back-fill with 99.5 % N₂ and heat-seal; residual O₂ <0.3 % keeps them oxide-free for 3 years.
2. Cabinet spec.
304 stainless enclosure with regenerative molecular sieve, set to 25 %RH and 20 °C; door sealed with one-time tamper-evident tape, inspected monthly.
304 stainless enclosure with regenerative molecular sieve, set to 25 %RH and 20 °C; door sealed with one-time tamper-evident tape, inspected monthly.
3. Stock rotation
Strict FIFO; quarterly PMI spot check (Ni 24-27 %, Cr 13-16 %) to avoid supplier batch mixing.
Example: an offshore platform had Special Alloy Double End Stud in stock for 18 months; re-test showed Cr 12.1 % – below the spec. minimum. All 1 200 pcs were scrapped, losing 800 k CNY.
Strict FIFO; quarterly PMI spot check (Ni 24-27 %, Cr 13-16 %) to avoid supplier batch mixing.
Example: an offshore platform had Special Alloy Double End Stud in stock for 18 months; re-test showed Cr 12.1 % – below the spec. minimum. All 1 200 pcs were scrapped, losing 800 k CNY.
IV. Second on-site transfer – wear “gloves + shoe covers”
1. Personnel
Cotton gloves → nitrile gloves double layer to keep sweat chloride (up to 150 ppm) away from Special Alloy Double End Stud.
1. Personnel
Cotton gloves → nitrile gloves double layer to keep sweat chloride (up to 150 ppm) away from Special Alloy Double End Stud.
2. Tools
Use nylon slings or stainless trays; steel wire ropes are forbidden (Fe-ion transfer can start rust within 24 h).
Use nylon slings or stainless trays; steel wire ropes are forbidden (Fe-ion transfer can start rust within 24 h).
3. Time limit
From dry cabinet to flange installation Special Alloy Double End Stud must be exposed to air ≤2 h. If rain pushes humidity >70 %, pre-heat in a temporary oven at 80 °C for 30 min to drive off adsorbed water film before assembly.
From dry cabinet to flange installation Special Alloy Double End Stud must be exposed to air ≤2 h. If rain pushes humidity >70 %, pre-heat in a temporary oven at 80 °C for 30 min to drive off adsorbed water film before assembly.
V. Common-mistakes wall chart
| Wrong practice | Consequence | Case |
| Store together with carbon-steel bolts | Galvanic corrosion, red rust on Special Alloy Double End Stud | Refinery 2021 |
| Wrap in kraft paper | Sulphur 0.8 % in paper causes grain-boundary embrittlement at high temp | ASTM A453 App. X1 |
| Spray common rust-preventive oil | Oil contains Cl⁻; at 650 °C chloride penetrates grain boundaries → SCC | Gas-turbine failure 2020 |
VI. One-touch checklist (warehouseman, 2 min)
□ Temp. 15-25 °C, RH ≤45 %
□ Vacuum bag of Special Alloy Double End Stud intact, batch label present
□ Separated from carbon-steel / pickling area ≥1.5 m
□ Dry-cabinet O₂ <0.3 %, record signed
□ Next-month production schedule linked to FIFO batch
□ Temp. 15-25 °C, RH ≤45 %
□ Vacuum bag of Special Alloy Double End Stud intact, batch label present
□ Separated from carbon-steel / pickling area ≥1.5 m
□ Dry-cabinet O₂ <0.3 %, record signed
□ Next-month production schedule linked to FIFO batch
Follow the steps above and Special Alloy Double End Stud can sit on the shelf for 3 years without rust or contamination, then run 100 000 h on the unit: 0 corrosion, 0 seizing, 0 breakage.
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