Womic Stainless Steel Co., Ltd
Exceptional High-Temperature Creep Strength: Controlled carbon content (0.06-0.10%) and optimized aluminum/titanium additions provide superior creep-rupture strength compared to Alloy 800H, ensuring decades of reliable service in petrochemical cracking applications.
Outstanding Carburization Resistance: High chromium content (19-23%) provides excellent resistance to carbon absorption (carburization) in hydrocarbon service, preventing embrittlement and extending tube life in ethylene cracking furnaces.
Superior Oxidation Resistance: Excellent resistance to oxidation and scaling up to 1100°C (2012°F) in continuous service, with good resistance to cyclic oxidation.
Excellent High-Temperature Stability: Metallurgical stability at elevated temperatures with resistance to sigma phase embrittlement, ensuring long-term microstructural integrity.
Good Sulfidation Resistance: Provides good resistance to sulfur-containing atmospheres at elevated temperatures, suitable for hydrocarbon feedstocks with sulfur content.
Excellent Creep-Rupture Ductility: Maintains good ductility even after long-term high-temperature exposure, allowing for inspection and remaining life assessment.
Surface Quality: Smooth internal and external surfaces available in annealed, pickled, or polished conditions for critical petrochemical applications.
Mechanical Strength: High tensile and yield strength at elevated temperatures suitable for high-pressure steam reforming and cracking service.
Good Weldability: Offers good weldability with matching filler metals. Preheating is generally not required for section thicknesses up to 5mm.
Proven Industry Track Record: Alloy 800HT has decades of proven service in the world's most demanding ethylene cracking and steam reforming furnaces
International Certification: Tubes can be certified by ABS, BV, DNV, LR, GL, RINA, CCS, KR, and NK, and comply with ASTM B407, ASME SB407, NORSOK M-650, and EN 10216-5 standards.
The Alloy 800HT Superalloy Steel Tubes produced by Womic Steel conform to multiple international specifications used in petrochemical, refining, and high-temperature applications:
|
Standard |
Description |
Equivalent Grade / Material Number |
|
ASTM B407 / ASME SB407 |
Seamless nickel-iron-chromium alloy pipe and tube |
UNS N08811 (Alloy 800HT) |
|
ASTM B408 |
Nickel-iron-chromium alloy plate, sheet, and strip |
UNS N08811 |
|
ASTM B163 / ASME SB163 |
Seamless nickel and nickel alloy condenser and heat exchanger tubes |
UNS N08811 |
|
EN 10216-5 |
Seamless stainless steel tubes for pressure purposes |
1.4959 (X10NiCrAlTi32-20) |
|
DIN 17458 |
Austenitic stainless seamless tubes |
X10NiCrAlTi32-20 |
|
ISO 6207 |
Nickel alloy seamless tubes |
X10NiCrAlTi32-20 |
|
NORSOK M-650 |
Qualification of special materials |
Alloy 800HT |
|
ASME Section VIII |
Pressure vessel code |
SB407 N08811 |
These standards ensure that Alloy 800HT Superalloy Steel Tubes meet global requirements for chemical composition, mechanical performance, testing, and dimensional accuracy.
Different specifications can be customized according to special requirements.
|
Execution Standard |
Main Standard |
Standard Grade |
|
ASTM (USA) |
ASTM B407, B408, B163, B622, B444 |
Alloy 800HT (N08811), Alloy 800H (N08810), Alloy 625 (N06625), Inconel 600 (N06600), Hastelloy C276 (N10276) |
|
ASME (USA) |
SB407, SB163, SB622, SB444 |
Alloy 800HT, Alloy 800H, Alloy 625, Inconel 600, Hastelloy C276 |
|
EN / DIN (Europe) |
EN 10216-5, EN 10217-7 |
1.4959 (Alloy 800HT), 1.4876 (Alloy 800H), 2.4856 (Alloy 625), 2.4816 (Inconel 600) |
|
ISO (International) |
ISO 6207 |
X10NiCrAlTi32-20 (1.4959), X8NiCrAlTi31-21 (1.4958) |
|
NORSOK (Norway) |
NORSOK M-650 |
Alloy 800HT, Alloy 800H |
|
Element |
Ni |
Cr |
Fe |
C |
Mn |
P |
S |
Si |
Al |
Ti |
Al+Ti |
Cu |
|
Alloy 800HT |
30.0–35.0 |
19.0–23.0 |
≥39.5 |
0.06–0.10 |
≤1.5 |
≤0.045 |
≤0.015 |
≤1.0 |
0.15–0.60 |
0.15–0.60 |
0.85–1.20 |
≤0.75 |
Note: Alloy 800HT (UNS N08811) is a controlled chemistry version of Alloy 800H with tighter carbon, aluminum, and titanium specifications. Compared to standard Alloy 800H (UNS N08810), Alloy 800HT offers significantly higher creep-rupture strength, making it the preferred material for the most demanding petrochemical cracking applications. The controlled addition of aluminum and titanium (total 0.85-1.20%) promotes the formation of stable precipitates that enhance high-temperature strength without compromising ductility.
Comparison of Alloy 800 Grades:
|
Property |
Alloy 800 |
Alloy 800H |
Alloy 800HT |
|
UNS Number |
N08800 |
N08810 |
N08811 |
|
Carbon (%) |
≤0.10 |
0.05–0.10 |
0.06–0.10 |
|
Al+Ti (%) |
— |
— |
0.85–1.20 |
|
Creep Strength |
Standard |
Higher |
Highest |
|
Typical Application |
General service |
High-temperature |
Reformer/Cracking |
Comparison with Other High-Temperature Alloys:
|
Property |
Alloy 800HT |
Inconel 600 |
Alloy 625 |
310H Stainless |
|
Nickel (%) |
30-35 |
≥72 |
≥58 |
19-22 |
|
Chromium (%) |
19-23 |
14-17 |
20-23 |
24-26 |
|
Carburization Resistance |
Excellent |
Excellent |
Good |
Poor |
|
Creep Strength (800°C) |
Excellent |
Good |
Excellent |
Poor |
|
Relative Cost |
High |
Very High |
Premium |
Low |
|
Typical Application |
Reformer/Cracking |
Furnace |
Marine/Chemical |
Heat treat |
The Alloy 800HT Superalloy Steel Tube offers excellent high-temperature strength and creep resistance for demanding petrochemical applications.
|
Property |
Unit |
Alloy 800HT (Annealed) |
|
Tensile Strength (min) |
MPa |
≥515 |
|
Yield Strength (0.2% offset, min) |
MPa |
≥205 |
|
Elongation (min) |
% |
≥30 |
|
Hardness (typical) |
HBW |
≤200 |
|
Density |
g/cm³ |
7.94 |
|
Melting Range |
°C |
1350–1400 |
|
Thermal Conductivity (20°C) |
W/m·K |
11.5 |
|
Coefficient of Thermal Expansion (20–100°C) |
μm/m·K |
14.0 |
|
Modulus of Elasticity (20°C) |
GPa |
195 |
High-Temperature Tensile Properties (Typical Values) :
|
Temperature (°C) |
Tensile Strength (MPa) |
Yield Strength (MPa) |
|
20 |
600–700 |
250–350 |
|
200 |
560–650 |
220–300 |
|
400 |
530–620 |
200–280 |
|
500 |
520–600 |
190–270 |
|
600 |
500–580 |
180–260 |
|
700 |
450–530 |
170–240 |
|
800 |
350–420 |
150–200 |
|
900 |
250–320 |
100–140 |
|
1000 |
160–220 |
60–90 |
|
1100 |
100–140 |
30–50 |
Creep Rupture Strength (Typical Values – Alloy 800HT Superiority) :
|
Temperature (°C) |
10,000 Hour Stress (MPa) |
100,000 Hour Stress (MPa) |
|
600 |
180–220 |
140–170 |
|
650 |
140–170 |
100–130 |
|
700 |
100–130 |
70–90 |
|
750 |
70–90 |
45–60 |
|
800 |
45–60 |
30–40 |
|
850 |
30–40 |
18–25 |
|
900 |
18–25 |
10–15 |
|
950 |
10–15 |
6–10 |
Comparison of Creep Strength (Alloy 800HT vs Alloy 800H at 100,000 hours) :
|
Temperature (°C) |
Alloy 800H (MPa) |
Alloy 800HT (MPa) |
Improvement |
|
700 |
50-60 |
70-90 |
+40% |
|
750 |
30-40 |
45-60 |
+50% |
|
800 |
20-25 |
30-40 |
+50% |
|
850 |
10-15 |
18-25 |
+60% |
Maximum Recommended Service Temperatures:
|
Service Type |
Maximum Temperature |
|
Continuous Service (Oxidizing Atmosphere) |
1100°C (2012°F) |
|
Continuous Service (Carburizing Atmosphere) |
980°C (1800°F) |
|
Continuous Service (Hydrocarbon Service) |
1050°C (1922°F) |
|
Intermittent Service |
1150°C (2102°F) |
|
Minimum Service Temperature |
-196°C (-321°F) |
Alloy 800HT Superalloy Steel Tube – Heat Treatment Condition:
Alloy 800HT tubes are supplied in the annealed condition (solution annealed at 1100–1175°C) followed by rapid cooling (water quenching or rapid air cooling). This heat treatment:
Dissolves precipitated carbides and optimizes grain size.
Relieves internal stresses from cold drawing or cold pilgering.
Develops the fine precipitate structure for optimal creep strength.
Ensures optimum corrosion resistance and high-temperature stability.
Critical Note: Alloy 800HT is specifically designed for high-temperature creep service. The controlled carbon, aluminum, and titanium content promotes the formation of stable precipitates during service that enhance creep strength. The alloy should be used in the solution annealed condition (grain size ASTM 5 or coarser) for optimal creep properties.
Alloy 800HT Superalloy Steel Tube – Delivery Condition:
Tubes are normally supplied in solution annealed and pickled condition, providing a clean, smooth surface and good corrosion resistance. Upon request, bright annealed (BA) finish can be provided for applications requiring ultra-clean internal surfaces.
Womic Steel adopts advanced production technology to ensure each Alloy 800HT Superalloy Steel Tube meets exact specifications and flawless surface quality.
· Raw Material Selection: High-quality Alloy 800HT billets from certified premium mills (Special Metals, VDM Metals, Sandvik) with certified chemical composition (Ni 30-35%, Cr 19-23%, C 0.06-0.10%, Al+Ti 0.85-1.20% verification) and traceability.
· Heating and Piercing: Billets heated to a controlled temperature range (1150–1200°C) and pierced using a rotary piercing mill to form hollow shells.
· Hot Rolling: Shells elongated and rolled to desired intermediate size with strict temperature control.
· Cold Drawing / Cold Pilgering: Tubes refined to precise dimensions and improved surface finish. Multiple passes with intermediate annealing required.
· Solution Annealing: Heat treatment at 1100–1175°C followed by rapid cooling to optimize grain size and develop creep properties.
· Pickling & Passivation: Removal of oxides using specialized pickling acids; thorough rinsing required.
· Straightening and Dimensional Calibration: Ensures consistent roundness and wall uniformity.
· Final Inspection & Marking: Each tube tested, marked with grade, heat number, standard, and tube dimensions before packing.
This process guarantees a smooth internal bore, high structural integrity, and exceptional high-temperature creep strength across all batches of Womic Steel’s Alloy 800HT Superalloy SteelTubes.
Womic Steel utilizes state-of-the-art manufacturing technology to ensure every Alloy 800HT Welded Superalloy Steel Tube meets precise specifications and delivers excellent surface quality and performance.
Raw Material Selection: High-quality Alloy 800HT strips/coils from certified premium mills with full traceability.
Slitting & Uncoiling: The steel coil is slit to the required width and uncoiled for feeding into the forming mill.
Forming & Welding: The strip is progressively formed into a cylindrical shape and the edges are welded together using advanced TIG or Plasma welding techniques with matching filler metal (ERNiCr-3 or ERNiCrCoMo-1) to create a solid weld seam.
Weld Seam Treatment: The external weld bead is removed to achieve a smooth surface, and the internal bead may be controlled or treated for bore cleanliness.
Solution Annealing: A full heat treatment process at 1100–1175°C is applied to dissolve carbides, restore corrosion resistance, and relieve stresses from welding and forming.
Sizing & Calibration: The tube is passed through a sizing mill to achieve the final precise outer diameter and roundness.
Straightening: The tube is straightened to ensure optimal linearity.
Pickling & Passivation: Chemical treatment removes scale and impurities, while promoting the formation of a protective passive oxide layer on the surface, including the weld zone.
Non-Destructive Testing (NDT) : The weld seam is inspected using methods like Eddy Current or Ultrasonic Testing to ensure integrity and quality.
Final Inspection & Marking: Each tube undergoes dimensional checks, visual inspection, and is marked with grade, heat number, and relevant standards before packaging.
This controlled process guarantees a consistent weld seam, excellent dimensional accuracy, and superior high-temperature creep performance for every batch of Womic Steel’s Alloy 800HT Welded Superalloy Steel Tubes.
1. Outside Diameter: 6.0mm – 168mm (1/4″ – 6.625″)
2. Wall Thickness: 1.0mm – 12.7mm (0.040″ – 0.500″)
3. Length: Up to 20m (straight lengths)
4. OD Tolerances:
Standard: ±0.10mm
Precision: ±0.05mm (upon request)
5. Wall Thickness Tolerances:
Standard: ±10% of nominal
Precision: ±8% of nominal (upon request)
6. Straightness: 0.5mm per 1000mm length typical
|
OD (mm) |
WT 1.6mm |
WT 2.0mm |
WT 2.5mm |
WT 3.0mm |
WT 4.0mm |
WT 5.0mm |
WT 6.0mm |
|
12.70 (1/2″) |
✓ |
✓ |
— |
— |
— |
— |
— |
|
15.88 (5/8″) |
✓ |
✓ |
✓ |
— |
— |
— |
— |
|
19.05 (3/4″) |
✓ |
✓ |
✓ |
✓ |
— |
— |
— |
|
25.40 (1″) |
— |
✓ |
✓ |
✓ |
✓ |
— |
— |
|
31.80 (1-1/4″) |
— |
— |
✓ |
✓ |
✓ |
— |
— |
|
38.10 (1-1/2″) |
— |
— |
✓ |
✓ |
✓ |
✓ |
— |
|
50.80 (2″) |
— |
— |
— |
✓ |
✓ |
✓ |
✓ |
|
60.30 (2-3/8″) |
— |
— |
— |
— |
✓ |
✓ |
✓ |
|
73.00 (2-7/8″) |
— |
— |
— |
— |
— |
✓ |
✓ |
|
88.90 (3-1/2″) |
— |
— |
— |
— |
— |
— |
✓ |
|
101.60 (4″) |
— |
— |
— |
— |
— |
— |
✓ |
|
114.30 (4-1/2″) |
— |
— |
— |
— |
— |
— |
✓ |
|
141.30 (5-5/8″) |
— |
— |
— |
— |
— |
— |
✓ |
|
168.28 (6-5/8″) |
— |
— |
— |
— |
— |
— |
✓ |
|
OD (mm) |
WT 1.0mm |
WT 1.2mm |
WT 1.6mm |
WT 2.0mm |
WT 2.5mm |
WT 3.0mm |
|
6.35 (1/4″) |
✓ |
✓ |
— |
— |
— |
— |
|
9.53 (3/8″) |
✓ |
✓ |
✓ |
— |
— |
— |
|
12.70 (1/2″) |
✓ |
✓ |
✓ |
✓ |
— |
— |
|
15.88 (5/8″) |
— |
✓ |
✓ |
✓ |
✓ |
— |
|
19.05 (3/4″) |
— |
— |
✓ |
✓ |
✓ |
✓ |
|
25.40 (1″) |
— |
— |
— |
✓ |
✓ |
✓ |
|
ANSI B 36.19/ANSI B36.10 DIMENSIONS OF SEAMLESS &WELDED STAINLESS STEEL PIPE |
|||||||||||||||||||
|
Nominalsize |
mm |
ANSIB36.19 |
ANSIB36.10ANSIB36.10 |
||||||||||||||||
|
DN |
NPS |
mm |
5S |
10S |
40S |
80S |
10 |
20 |
30 |
STD |
40 |
60 |
XS |
80 |
100 |
120 |
140 |
160XXS |
|
|
6 |
1/8" |
10.29 |
|
1.24 |
1.73 |
2.41 |
|
|
|
1.73 |
1.73 |
|
2.41 |
2.41 |
|
|
|
|
|
|
8 |
1/4" |
13.72 |
|
1.65 |
2.24 |
3.02 |
|
|
|
2.24 |
2.24 |
|
3.02 |
3.02 |
|
|
|
|
|
|
10 |
3/8" |
17.15 |
|
1.65 |
2.31 |
3.20 |
|
|
|
2.31 |
2.31 |
|
3.20 |
3.20 |
|
|
|
|
|
|
15 |
1/2" |
21.34 |
1.65 |
2.11 |
2.77 |
3.73 |
|
|
|
2.77 |
2.77 |
|
3.73 |
3.73 |
|
|
|
4.78 |
7.47 |
|
20 |
3/4" |
26.67 |
1.65 |
2.11 |
2.87 |
3.91 |
|
|
|
2.87 |
2.87 |
|
3.91 |
3.91 |
|
|
|
5.56 |
7.82 |
|
25 |
1" |
33.4 |
1.65 |
2.77 |
3.38 |
4.55 |
|
|
|
3.38 |
3.38 |
|
4.55 |
4.55 |
|
|
|
6.35 |
9.09 |
|
32 |
1 1/4" |
42.16 |
1.65 |
2.77 |
3.56 |
4.85 |
|
|
|
3.56 |
3.56 |
|
4.85 |
4.85 |
|
|
|
6.35 |
9.70 |
|
40 |
1 1/2" |
48.26 |
1.65 |
2.77 |
3.68 |
5.08 |
|
|
|
3.68 |
3.68 |
|
5.08 |
5.08 |
|
|
|
7.14 |
10.16 |
|
50 |
2" |
60.33 |
1.65 |
2.77 |
3.91 |
5.54 |
|
|
|
3.91 |
3.91 |
|
5.54 |
5.54 |
|
|
|
8.74 |
11.07 |
|
65 |
2 1/2" |
73.03 |
2.11 |
3.05 |
5.16 |
7.01 |
|
|
|
5.16 |
5.16 |
|
7.01 |
7.01 |
|
|
|
9.52 |
14.02 |
|
80 |
3" |
88.9 |
2.11 |
3.05 |
5.49 |
7.62 |
|
|
|
5.49 |
5.49 |
|
7.62 |
7.62 |
|
|
|
11.13 |
15.24 |
|
90 |
3 1/2" |
101.6 |
2.11 |
3.05 |
5.74 |
8.08 |
|
|
|
5.74 |
5.74 |
|
8.08 |
8.08 |
|
|
|
|
|
|
100 |
4" |
114.3 |
2.11 |
3.05 |
6.02 |
8.56 |
|
|
|
6.02 |
6.02 |
|
8.56 |
8.56 |
|
11.13 |
|
13.50 |
17.12 |
|
125 |
5” |
141.3 |
2.77 |
3.40 |
6.55 |
9.52 |
|
|
|
6.55 |
6.55 |
|
9.52 |
9.52 |
|
12.70 |
|
15.90 |
19.05 |
|
150 |
6" |
168.28 |
2.77 |
3.40 |
7.11 |
10.97 |
|
|
|
7.11 |
7.11 |
|
10.97 |
10.97 |
|
14.30 |
|
18.20 |
21.95 |
|
200 |
8" |
219.08 |
2.77 |
3.76 |
8.18 |
12.70 |
|
6.35 |
7.04 |
8.18 |
8.18 |
10.30 |
12.70 |
12.70 |
15.10 |
18.20 |
20.60 |
23.00 |
22.22 |
|
250 |
10" |
273.05 |
3.40 |
4.19 |
9.27 |
12.70 |
|
6.35 |
7.80 |
9.27 |
9.27 |
12.70 |
12.70 |
15.09 |
18.26 |
21.44 |
25.40 |
28.58 |
|
|
300 |
12" |
323.85 |
3.96 |
4.57 |
9.52 |
12.70 |
|
6.35 |
8.38 |
9.52 |
10.31 |
14.27 |
12.70 |
17.48 |
21.44 |
25.40 |
28.58 |
33.32 |
|
|
350 |
14" |
355.6 |
3.98 |
4.78 |
|
|
6.35 |
7.92 |
9.52 |
9.52 |
11.13 |
15.09 |
12.70 |
19.05 |
23.83 |
27.79 |
31.75 |
35.71 |
|
|
400 |
16" |
406.4 |
4.19 |
4.78 |
|
|
6.35 |
7.92 |
9.52 |
9.52 |
12.70 |
16.66 |
12.70 |
21.44 |
26.19 |
30.96 |
36.53 |
40.49 |
|
|
450 |
18" |
459.2 |
4.19 |
4.78 |
|
|
6.35 |
7.92 |
11.13 |
9.52 |
14.27 |
19.05 |
12.70 |
23.83 |
29.36 |
34.92 |
39.67 |
45.24 |
|
|
500 |
20" |
508 |
4.77 |
5.53 |
|
|
6.35 |
9.52 |
12.70 |
9.52 |
15.09 |
20.62 |
12.70 |
26.19 |
32.54 |
38.10 |
44.45 |
50.01 |
|
|
550 |
22" |
558.8 |
4.77 |
5.53 |
|
|
6.35 |
9.52 |
12.70 |
9.52 |
15.87 |
22.22 |
12.70 |
28.57 |
34.92 |
41.27 |
47.62 |
53.97 |
|
|
600 |
24" |
609.6 |
5.54 |
6.35 |
|
|
6.35 |
9.52 |
14.70 |
9.52 |
17.48 |
24.61 |
12.70 |
30.96 |
38.89 |
46.02 |
52.37 |
59.94 |
|
|
650 |
26" |
660.4 |
|
|
|
|
7.92 |
12.70 |
|
9.52 |
|
|
12.70 |
|
|
|
|
|
|
|
700 |
28" |
711.2 |
|
|
|
|
7.92 |
12.70 |
15.88 |
9.52 |
|
|
12.70 |
|
|
|
|
|
|
|
750 |
30" |
762 |
6.35 |
7.92 |
|
|
7.92 |
12.70 |
15.88 |
9.52 |
|
|
12.70 |
|
|
|
|
|
|
|
800 |
32" |
812.8 |
|
|
|
|
7.92 |
12.70 |
15.88 |
9.52 |
|
|
12.70 |
|
|
|
|
|
|
Womic Steel offers a wide range of surface finishes to meet various petrochemical, refining, and high-temperature applications.
|
Surface Type |
Description |
|
Annealed & Pickled (AP Finish) |
Standard industrial finish – matte, oxide-free after acid treatment. Suitable for most petrochemical and furnace applications. |
|
Bright Annealed (BA Finish) |
Mirror-like surface obtained through controlled atmosphere annealing. |
|
Polished Finish (180#, 240#, 320#) |
Smooth mechanical finish suitable for high-purity applications. |
|
Passivated Finish |
Surface chemically treated to enhance corrosion protection. |
|
Grit Blasted Finish |
Matte surface finish for specialized furnace applications. |
Each Alloy 800HT Superalloy Steel Tube surface is inspected for uniform appearance, absence of pits, and consistent finish quality.
Every Alloy 800HT Superalloy Steel Tube undergoes comprehensive inspection in accordance with ASTM B407, EN 10216-5, and NORSOK M-650 standards to guarantee reliability and performance:
|
Test / Inspection |
Description |
Applicability |
|
Visual & Dimensional Inspection |
Surface, roundness, and thickness checked. |
100% |
|
Hydrostatic Pressure Test |
100% tested for leakage and pressure resistance. |
100% |
|
Eddy Current Test (ECT) |
Detects surface and sub-surface imperfections. |
100% |
|
Ultrasonic Test (UT) |
Ensures internal integrity of the seamless structure. |
Upon request |
|
Positive Material Identification (PMI) |
Confirms correct chemical grade (Ni, Cr, Al, Ti verification). |
100% (per heat) |
|
Grain Size Measurement |
ASTM E112 – ensures grain size ASTM 5 or coarser for creep. |
Per heat |
|
Stress Rupture Testing |
High-temperature stress rupture verification (typical at 800-900°C). |
Per heat |
|
Creep Rupture Testing |
Long-term creep strength verification. |
Upon request |
|
Flattening & Flaring Tests |
Evaluate ductility and deformation capability. |
Per heat / batch |
|
Hardness & Tensile Testing |
Confirms mechanical compliance with ASTM standards. |
Per heat / batch |
|
High-Temperature Tensile Testing |
Verifies strength at elevated temperatures. |
Upon request |
|
Surface Roughness and Cleanliness Check |
For polished or high-purity tubes. |
Upon request |
|
Third-Party Inspection (SGS / BV / DNV / TUV) |
Available upon customer request. |
Upon request |
These extensive tests ensure that every Alloy 800HT Superalloy Steel Tube from Womic Steel meets the highest international standards for reliability and longevity.
Alloy 800HT Superalloy Steel Tube is the industry standard for the most demanding high-temperature petrochemical applications:
|
Industry |
Typical Applications |
|
Petrochemical (Ethylene Cracking) |
Ethylene cracking furnace tubes, radiant coils, transfer line exchangers, quenching coolers, pyrolysis furnace tubes (ship classification certifications available for offshore petrochemical applications). |
|
Hydrogen Production |
Steam methane reformer (SMR) tubes, primary reformer tubes, secondary reformer heat exchangers, high-temperature hydrogen coolers, ammonia reformer tubes, methanol reformer tubes. |
|
Chemical Processing |
High-temperature process heaters, acetic acid reformers, phthalic anhydride heat exchangers, maleic anhydride reactors. |
|
Refining |
Catalytic reformer heat exchangers, hydrogen reformer tubes, high-temperature hydrocracker heat exchangers. |
|
Fertilizer Production |
Ammonia plant primary reformer tubes, secondary reformer tubes, high-temperature shift converter coolers. |
|
Power Generation |
High-temperature heat recovery steam generators (HRSG) – highest temperature zones, superheater tubes, reheater tubes. |
|
Heat Treatment Furnaces |
Radiant tube heat exchangers, furnace recuperators, annealing furnace components, carburizing furnace components. |
|
Hydrogen Economy |
High-temperature hydrogen heat exchangers, solid oxide fuel cell (SOFC) components, hydrogen production facilities. |
|
Waste Heat Recovery |
Gas turbine exhaust heat exchangers, incinerator waste heat boilers, refinery waste heat recovery units. |
|
Marine Engineering |
High-temperature exhaust gas heat exchangers, boiler superheaters for LNG carriers and petrochemical vessels. |
Each Alloy 800HT Superalloy Steel Tube is securely packed and clearly labeled to ensure safe and efficient transport worldwide.
General packaging for
local truck transport:
Bundle packing with woven fabric, iron strip bundle, plastic cap on two ends.
Hexagonal packaging:
Bundle packing with woven fabric, iron strip bundle, plastic cap on two ends.
Packaging for
reformer and cracking tubes:
Wooden crate with foam padding, individual tube separation, plastic end caps
for export sea-worthy transport.
General packaging for
products to be exported:
Wooden box for export sea-worthy transport.
Packaging for
long-length furnace tubes:
Steel crates with internal support to prevent bending, end caps with moisture
barrier.
Packaging for
precision and small-diameter tubes:
Individual wrapping, foam padding, wooden crate with moisture barrier.
Direct cooperation with global shipowners ensures the most competitive freight rates.
Professional loading and securing teams guarantee damage-free shipment.
Efficient document preparation (EN 10204 3.1/3.2 certificates, MTR, heat treatment certificates, stress rupture test reports), minimizing customs delays.
Rapid delivery time — select sizes kept in ready stock.
Continuous cargo tracking and after-sales follow-up to ensure smooth arrival at destination.
Womic Steel is a trusted manufacturer and exporter specializing in Alloy 800HT Superalloy Steel Tubes, committed to delivering premium quality and professional service for the world's most demanding petrochemical applications.
Strict quality control under ISO 9001, ASME, and PED certification.
Petrochemical industry standard – decades of proven service in ethylene cracking and steam reforming furnaces.
Superior creep strength – 40-60% higher creep-rupture strength than Alloy 800H.
Excellent carburization resistance – extends tube life in hydrocarbon service.
Controlled grain size – ASTM 5 or coarser for optimal creep properties.
Modern production lines and experienced technicians.
Complete testing, inspection, and documentation support including stress rupture testing.
Flexible customization and surface finishing options.
Fast production cycle and reliable global shipping.
Premium mill relationships – direct sourcing from Special Metals, VDM Metals, Sandvik.
Full traceability – from melt to final tube, complete certification package.
Proven track record – Alloy 800HT tubes supplied to major ethylene plants and hydrogen reformer facilities worldwide.
