Heat Resistant Steel Boiler Slider Blocks
International Grades & Property Analysis
Boiler slider blocks (also known as furnace bottom sliders, water beam sliders, and wear pads) operate under harsh conditions including high temperatures ranging from 900°C to 1200°C, heavy loads, continuous friction, and strong oxidizing atmospheres. Key performance requirements include excellent heat resistance, high-temperature creep strength, wear resistance, thermal shock resistance, and minimal deformation.
Below is a detailed analysis of commonly used international standard heat-resistant alloy grades for boiler slider blocks.
1. Chromium-Nickel Austenitic Heat-Resistant Alloys
HK40 (UNS J94204)
Continuous operating temperature: Up to 1000°C
Key characteristics:
Stable austenitic microstructure at elevated temperatures
Excellent high-temperature oxidation resistance
Good structural stability and long service life
Cost-effective for general applications
Limitations: Moderate wear resistance and creep strength above 1000°C
Application: Light-load slider blocks in medium-temperature furnace zones
HP40 (UNS J94605)
Continuous operating temperature: Up to 1050°C
Key characteristics:
Niobium-strengthened alloy with improved high-temperature strength
Higher creep resistance and thermal fatigue performance than HK40
Better resistance to deformation and cracking under cyclic heating
Longer service life in medium-to-high temperature environments
Application: Medium-load slider blocks in high-temperature furnace sections
2848W5 (UNS J95705)
Continuous operating temperature: Up to 1100°C, short-term up to 1200°C
Key characteristics:
Ultra-high chromium and nickel content for exceptional stability
Tungsten addition significantly enhances hardness and wear resistance
Outstanding resistance to high-temperature deformation and thermal shock
Low tendency to crack or deform under heavy loads
Application: Heavy-duty, long-life slider blocks in walking beam furnaces, reheating furnaces, and high-temperature zones
2. Cobalt-Based Superalloys (Stellite Series)
Typical grades: Stellite 6, Stellite 12, Stellite 20
Continuous operating temperature: 1050°C – 1300°C
Key characteristics:
Ultra-high heat resistance and wear resistance at extreme temperatures
Excellent anti-galling and anti-seizure properties
Low thermal expansion coefficient and high dimensional stability
Does not stick to steel slabs or cause surface scratches
Limitations: Higher material cost
Application: High-precision, ultra-high temperature slider blocks with strict anti-wear and anti-stick requirements
3. Low-Alloy Heat-Resistant Steels
ASTM A387 Grade 11 / A182 F11
Continuous operating temperature: ≤ 580°C
Key characteristics:
Good medium-temperature strength and creep resistance
Excellent weldability and low cost
Limitations: Rapid softening and oxidation above 600°C
Application: Low-temperature supporting components and non-sliding structural parts
Why Choose Our Heat Resistant Slider Blocks?
Professional manufacturer with mature casting technology
Strict chemical composition and mechanical property control
Customizable sizes and designs according to customer drawings
Stable quality, competitive factory price, and on-time delivery
Suitable for various industrial boilers, reheating furnaces, and walking beam furnaces
For inquiries, drawings, or quotations, please contact us anytime.
