The Flattened Threaded Anchors for Steel Mills are precision-engineered to deliver high-strength anchoring in steel mill equipment subjected to heavy static loads and extreme thermal cycling.
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Unlike cylindrical anchors that suffer from rotational slippage in refractory materials (causing 25% higher failure rates), these anchors feature a flattened profile (oval cross-section) that increases frictional resistance by 40% and rolled threads that enhance pull-out resistance. Constructed from 42CrMo4 alloy steel subjected to quenching (850°C) and tempering (550°C) heat treatment, they achieve 860MPa tensile strength and resist creep deformation at 600°C—critical properties for securing refractory linings in reheating furnaces, ladles, and coke ovens where operational reliability directly impacts production efficiency.
Parameter | Value |
Material | 42CrMo4 Alloy Steel (Quenched & Tempered) |
Temperature Range | -40°C to 600°C |
Tensile Strength | 860MPa |
Yield Strength | 720MPa |
Thread Type | Metric M16-M30 (rolled threads, 60° profile) |
Flattened Section | 1.5× diameter width, 0.7× diameter thickness |
Installation | Bolted with high-temp nuts (Inconel 718, rated to 600°C) |
Surface Treatment | Hot-dip galvanized (85μm coating, 95% coverage) |
High-Temperature Stability: The 42CrMo4 alloy’s tempered martensite microstructure retains 75% of its yield strength at 600°C, ensuring secure anchoring during 1600°C molten steel transfers in ladles. Long-term creep tests show less than 0.2% deformation after 10,000 hours at 550°C.
Enhanced Thread Integrity: Rolled threads (instead of cut threads) cold-work the steel, increasing thread root strength by 30% and resisting stripping under 50kN tensile loads—equivalent to the weight of 5 tons of steel billets. Thread hardness reaches HRC 35-40 for wear resistance.
Corrosion Protection: The hot-dip galvanized coating forms a zinc-iron alloy layer that resists slag corrosion (from CaO-SiO₂-Al₂O₃ slags) and cooling water exposure, extending service life by 5 years in coke oven environments compared to uncoated anchors.
Easy Adjustment: The threaded design allows for on-site length customization (±50mm) using couplers, reducing inventory requirements by 30% and enabling quick adaptation to varying refractory thicknesses (100mm-300mm).
Reheating Furnaces: Secures refractory walls in walking beam furnaces operating at 1200°C, withstanding 50+ daily thermal cycles (ambient to 1200°C) during billet heating processes without loosening.
Steel Ladles: Anchors refractory linings in 300-ton ladles, supporting 90kg/m² refractory weight during 8-hour holding periods. The flattened profile prevents anchor rotation during ladle tilting (up to 45° angles).
Coke Ovens: Resists alkali corrosion (from Na₂O and K₂O vapors) in oven walls, where temperatures fluctuate between 200°C (cooling) and 1000°C (coking). Outperforms carbon steel anchors by 3x in service life.
Continuous Casting Machines: Anchors thermal insulation layers in tundish covers, maintaining 200°C temperature gradients (1000°C interior to 800°C exterior) during steel casting, reducing heat loss by 15%.
Q: What is the recommended torque for installation?
A: For M24 anchors, apply 500N·m torque using a calibrated torque wrench. This achieves 70% of the bolt’s yield strength, ensuring secure fastening without thread damage in ladle refractory.
Q: Can they be used in cryogenic environments?
A: Yes, the 42CrMo4 alloy retains 80% of its toughness at -40°C (Charpy impact energy ≥27J), making it suitable for liquid nitrogen storage tanks and cold-weather steel mill operations.
Q: How do I inspect for wear?
A: Perform quarterly ultrasonic testing to detect thread root cracks (critical failure points) and visual inspections for galvanization loss. Replace anchors if thread depth reduces by >10% or corrosion affects >20% of surface area.
Q: Are non-galvanized options available?
A: Yes, stainless steel 316L variants are offered for chloride-rich environments (e.g., coastal steel mills). These cost 20% more but provide superior resistance to saltwater corrosion, with a service life of 10+ years in marine atmospheres.
Unlike cylindrical anchors that suffer from rotational slippage in refractory materials (causing 25% higher failure rates), these anchors feature a flattened profile (oval cross-section) that increases frictional resistance by 40% and rolled threads that enhance pull-out resistance. Constructed from 42CrMo4 alloy steel subjected to quenching (850°C) and tempering (550°C) heat treatment, they achieve 860MPa tensile strength and resist creep deformation at 600°C—critical properties for securing refractory linings in reheating furnaces, ladles, and coke ovens where operational reliability directly impacts production efficiency.
Parameter | Value |
Material | 42CrMo4 Alloy Steel (Quenched & Tempered) |
Temperature Range | -40°C to 600°C |
Tensile Strength | 860MPa |
Yield Strength | 720MPa |
Thread Type | Metric M16-M30 (rolled threads, 60° profile) |
Flattened Section | 1.5× diameter width, 0.7× diameter thickness |
Installation | Bolted with high-temp nuts (Inconel 718, rated to 600°C) |
Surface Treatment | Hot-dip galvanized (85μm coating, 95% coverage) |
High-Temperature Stability: The 42CrMo4 alloy’s tempered martensite microstructure retains 75% of its yield strength at 600°C, ensuring secure anchoring during 1600°C molten steel transfers in ladles. Long-term creep tests show less than 0.2% deformation after 10,000 hours at 550°C.
Enhanced Thread Integrity: Rolled threads (instead of cut threads) cold-work the steel, increasing thread root strength by 30% and resisting stripping under 50kN tensile loads—equivalent to the weight of 5 tons of steel billets. Thread hardness reaches HRC 35-40 for wear resistance.
Corrosion Protection: The hot-dip galvanized coating forms a zinc-iron alloy layer that resists slag corrosion (from CaO-SiO₂-Al₂O₃ slags) and cooling water exposure, extending service life by 5 years in coke oven environments compared to uncoated anchors.
Easy Adjustment: The threaded design allows for on-site length customization (±50mm) using couplers, reducing inventory requirements by 30% and enabling quick adaptation to varying refractory thicknesses (100mm-300mm).
Reheating Furnaces: Secures refractory walls in walking beam furnaces operating at 1200°C, withstanding 50+ daily thermal cycles (ambient to 1200°C) during billet heating processes without loosening.
Steel Ladles: Anchors refractory linings in 300-ton ladles, supporting 90kg/m² refractory weight during 8-hour holding periods. The flattened profile prevents anchor rotation during ladle tilting (up to 45° angles).
Coke Ovens: Resists alkali corrosion (from Na₂O and K₂O vapors) in oven walls, where temperatures fluctuate between 200°C (cooling) and 1000°C (coking). Outperforms carbon steel anchors by 3x in service life.
Continuous Casting Machines: Anchors thermal insulation layers in tundish covers, maintaining 200°C temperature gradients (1000°C interior to 800°C exterior) during steel casting, reducing heat loss by 15%.
Q: What is the recommended torque for installation?
A: For M24 anchors, apply 500N·m torque using a calibrated torque wrench. This achieves 70% of the bolt’s yield strength, ensuring secure fastening without thread damage in ladle refractory.
Q: Can they be used in cryogenic environments?
A: Yes, the 42CrMo4 alloy retains 80% of its toughness at -40°C (Charpy impact energy ≥27J), making it suitable for liquid nitrogen storage tanks and cold-weather steel mill operations.
Q: How do I inspect for wear?
A: Perform quarterly ultrasonic testing to detect thread root cracks (critical failure points) and visual inspections for galvanization loss. Replace anchors if thread depth reduces by >10% or corrosion affects >20% of surface area.
Q: Are non-galvanized options available?
A: Yes, stainless steel 316L variants are offered for chloride-rich environments (e.g., coastal steel mills). These cost 20% more but provide superior resistance to saltwater corrosion, with a service life of 10+ years in marine atmospheres.
