AISI 5155H Steel Seamless tube

AISI 5155H Steel Seamless tube Product Information -:- For detailed product information, please contact sales. -: AISI 5155H Steel Seamless tube Synonyms -:- For detailed product information, please contact sales. -:

AISI 5155H Steel Product Information -:- For detailed product information, please contact sales. -: # **AISI 5155H Hardenability-Controlled Alloy Steel - Technical Data Sheet** ## **1. Product Overview** **AISI 5155H** is a high-carbon chromium alloy steel manufactured with **guaranteed hardenability bands** according to SAE J1268 specifications. The "H" designation indicates precise chemical control within narrow limits to ensure **consistent and predictable heat treatment response** across all production lots. With a nominal composition of 0.55% carbon and 0.80% chromium, this steel represents the highest carbon grade in the standard 51xx H-grade series, providing maximum hardness potential with guaranteed consistency. This material is engineered for applications requiring **exceptional wear resistance and high strength** where predictable hardening behavior is critical. The H-grade certification ensures that components will achieve uniform hardness gradients and mechanical properties, enabling designers to optimize safety factors and performance expectations in demanding applications such as heavy-duty wear parts, tools, and high-stress components. --- ## **2. Chemical Composition (SAE J404/J412 with H-Grade Controls)** | Element | Composition Range (%) | H-Grade Control Significance | |---------|----------------------|-------------------------------| | **Carbon (C)** | 0.52 - 0.57 | Tightly controlled (±0.025% from nominal) for maximum hardness consistency | | **Manganese (Mn)** | 0.70 - 0.95 | Optimized range for predictable hardenability enhancement | | **Phosphorus (P)** | ≤ 0.030 | Reduced maximum for improved impact toughness | | **Sulfur (S)** | ≤ 0.035 | Controlled for optimal machinability without compromising properties | | **Silicon (Si)** | 0.15 - 0.35 | Controlled to minimize variation in hardenability response | | **Chromium (Cr)** | 0.65 - 0.90 | Primary alloying element with optimized range for consistent performance | | **Iron (Fe)** | Balance | Base matrix with controlled residual elements | **Material Designations:** - **SAE/AISI:** 5155H - **UNS:** G51551 - **Hardenability Standard:** SAE J1268 compliance - **Special Grades:** Tool Steel Quality (TSQ) available --- ## **3. Hardenability Characteristics (SAE J1268 Compliance)** ### **Guaranteed Hardenability Bands:** | Distance from Quenched End (1/16 inch) | Minimum HRC | Maximum HRC | Typical Production Range | |----------------------------------------|-------------|-------------|--------------------------| | **J1 (1.5 mm)** | 53 | 63 | 57-61 HRC | | **J4 (6.4 mm)** | 49 | 59 | 53-57 HRC | | **J7 (11.1 mm)** | 45 | 55 | 49-53 HRC | | **J10 (15.9 mm)** | 40 | 50 | 44-48 HRC | | **J14 (22.2 mm)** | 36 | 46 | 40-44 HRC | | **J20 (31.8 mm)** | 31 | 41 | 35-39 HRC | | **J30 (47.6 mm)** | 27 | 37 | 31-35 HRC | ### **Critical Diameter Data:** - **Ideal Critical Diameter (D₁) in oil:** 85-100 mm - **95% Martensite (D₉₅):** 75-90 mm - **50% Martensite (D₅₀):** 95-110 mm - **Maximum effective hardening diameter:** ~115 mm in oil quench - **Grossman Hardenability Factor:** 1.60-1.80 ### **Hardenability Consistency Metrics:** - **Lot-to-lot variation:** ≤±1.5 HRC at any standard distance - **Within-heat uniformity:** ≤±1.0 HRC for adjacent specimens - **Statistical process capability:** Cpk ≥ 1.67 for controlled points - **Heat-to-heat correlation:** ≥0.96 for chemistry vs. hardenability --- ## **4. Physical & Mechanical Properties** ### **As-Supplied Conditions:** **Annealed Condition (for machining):** - **Hardness:** 197-235 HB (93-101 HRB) - **Tensile Strength:** 620-850 MPa (90-123 ksi) - **Yield Strength (0.2% offset):** 380-585 MPa (55-85 ksi) - **Elongation (in 2"):** 16-22% - **Reduction of Area:** 38-48% - **Machinability Rating:** 30-35% (relative to 1212 steel = 100%) ### **Heat Treated Properties (Oil Quenched & Tempered):** **Standard Heat Treatment:** - **Austenitizing:** 815-835°C (1500-1535°F) - **Quenching:** Fast oil (ISO VG 68-150), strong agitation - **Tempering:** Based on required hardness **Property Matrix by Tempering Temperature:** | Tempering Temperature | Hardness Range (HRC) | Tensile Strength Range | Yield Strength Range | Charpy V-Notch Impact | |-----------------------|----------------------|------------------------|----------------------|-----------------------| | **150°C (300°F)** | 58-63 | 2000-2200 MPa | 1750-1950 MPa | 6-12 J | | **250°C (480°F)** | 54-59 | 1850-2050 MPa | 1650-1850 MPa | 10-18 J | | **350°C (660°F)** | 48-53 | 1650-1850 MPa | 1500-1700 MPa | 15-25 J | | **450°C (840°F)** | 42-47 | 1450-1650 MPa | 1300-1500 MPa | 25-40 J | | **550°C (1020°F)** | 36-41 | 1250-1450 MPa | 1150-1350 MPa | 40-60 J | ### **Property Uniformity (50mm diameter bar):** **After oil quench and temper at 350°C:** | Location | Hardness (HRC) | Variation | Tensile Strength | |----------|----------------|-----------|------------------| | Surface | 51.5 ±0.7 | Reference | 1750 ±30 MPa | | 1/4 Radius | 50.8 ±0.8 | -0.7 HRC | 1725 ±35 MPa | | 1/2 Radius | 50.1 ±1.0 | -1.4 HRC | 1700 ±40 MPa | | 3/4 Radius | 49.4 ±1.2 | -2.1 HRC | 1675 ±45 MPa | | Center | 48.7 ±1.5 | -2.8 HRC | 1650 ±50 MPa | ### **Physical Properties:** - **Density:** 7.85 g/cm³ (0.284 lb/in³) - **Modulus of Elasticity:** 205 GPa (29,700 ksi) - **Thermal Conductivity:** 42.5 W/m·K at 100°C - **Coefficient of Thermal Expansion:** 12.2 μm/m·°C (20-200°C) - **Specific Heat:** 460 J/kg·K at 20°C --- ## **5. Product Applications** ### **Heavy-Duty Wear Components:** - **Crusher rolls** and hammer mill parts - **Wear plates** for material handling systems - **Pulverizer components** in mining operations - **Scraper blades** and cutting edges - **Chute liners** and hopper wear surfaces ### **Tooling & Die Applications:** - **Cold forming dies** and die inserts - **Shear blades** for metal cutting - **Thread rolling dies** and form tools - **Punch and die sets** for heavy blanking - **Mandrels** for tube and pipe forming ### **Automotive & Heavy Equipment:** - **Track components** for crawler equipment - **Heavy-duty gears** for transmissions - **Wear-resistant shafts** and bushings - **Sprockets** for chain drives - **Earth-moving equipment** teeth ### **Industrial Machinery:** - **Gears** for heavy industrial gearboxes - **Rolls** for rolling mills - **High-stress shafts** in processing equipment - **Coupling components** in high-torque applications - **Bearing components** for special applications ### **Special Applications:** - **Agricultural tillage tools** - **Mining drill components** - **Railway track wear parts** - **Industrial knives** and cutting tools - **High-wear fasteners** and pins ### **Why Specify 5155H:** - Applications requiring **maximum hardness** with predictable results - **High-volume production** of wear components - **Critical applications** where consistency reduces safety factors - **Components** requiring certification and traceability - **Applications** where heat treatment distortion must be minimized --- ## **6. International Standards & Equivalents** ### **Primary Standards:** | Standard | Designation | Governing Specification | |----------|-------------|-------------------------| | **SAE/AISI** | **5155H** | SAE J404, J412, J1268 | | **UNS** | **G51551** | Unified Numbering System | | **ASTM** | - | A304 (H-Steel Bars) | ### **Global H-Grade Equivalents:** | Country/Region | Standard | H-Grade Equivalent | |----------------|----------|-------------------| | **International (ISO)** | ISO 683-11 | **55Cr3H** | | **Europe (EN)** | EN 10083-3 | **55Cr3H** | | **Germany** | DIN 17211 | **55Cr3H** | | **Japan** | JIS G4052 | **SUP10H** | | **China** | GB/T 5216 | **55CrSiH** | ### **Quality Standards:** - **Hardenability Testing:** SAE J1268 - **Material Cleanliness:** ASTM E45, AMS 2301 - **Heat Treatment:** AMS 2759, CQI-9 - **Traceability:** EN 10204 3.1/3.2 --- ## **7. Manufacturing & Processing** ### **Heat Treatment Guidelines:** **Pre-machining Annealing:** - **Spheroidize Annealing:** 740-760°C, slow cool - **Result:** 197-229 HB for machining **Through-Hardening:** 1. **Pre-heat:** 650-700°C 2. **Austenitize:** 825±5°C 3. **Quench:** Fast oil, strong agitation 4. **Temper:** Based on requirements 5. **Cool:** Air cool; rapid through 350-550°C ### **Machining Parameters:** - **Optimal Condition:** Annealed (197-229 HB) - **Cutting Speed:** 20-35 m/min (carbide) - **Feed Rate:** 0.10-0.20 mm/rev - **Tool Material:** Carbide grades C2-C5 - **Coolant:** Essential for tool life ### **Welding:** - **Rating:** Very poor (not recommended) - **If necessary:** Pre-heat 350-400°C, full re-heat treat required --- ## **8. Quality Assurance** ### **Certification Requirements:** - **Hardenability Test Report:** Complete Jominy curve - **Chemical Analysis:** Full elemental analysis - **Material Test Certificate:** EN 10204 3.1/3.2 - **Traceability:** Complete from melt to product ### **Quality Parameters:** - **Hardenability Compliance:** 100% within SAE J1268 bands - **Process Capability:** Cp ≥ 1.67 - **Lot-to-Lot Consistency:** ≤1.5 HRC variation - **Chemistry Control:** All elements within middle 70% of range --- ## **9. Technical Performance** ### **Fatigue Characteristics:** - **Rotating Bending Endurance:** 600-680 MPa at 50 HRC - **Fatigue Ratio:** 0.38-0.43 - **Notch Sensitivity:** Very high (q ≈ 0.90-0.95) ### **Wear Performance:** - **Abrasive Wear Resistance:** Excellent at >55 HRC - **Contact Fatigue Life:** L₁₀ > 2×10⁷ cycles at 2.2 GPa ### **Temperature Limits:** - **Maximum Service:** 250°C continuous - **Temper Resistance:** Fair to 300°C - **Cryogenic Suitability:** Not recommended below 0°C --- ## **10. Design Considerations** ### **Section Size Guidelines:** | Diameter (mm) | Hardness Gradient (ΔHRC) | Core Hardness (Min) | |---------------|--------------------------|---------------------| | ≤50 | ≤3.5 | 48 HRC | | 50-75 | ≤6.0 | 45 HRC | | 75-100 | ≤9.0 | 42 HRC | | 100-125 | ≤12.0 | 38 HRC | ### **Allowable Stresses (Safety Factor = 2.5):** - **Static Tension:** 700 MPa - **Static Shear:** 400 MPa - **Fully Reversed Bending:** 280 MPa --- ## **11. Economic Considerations** ### **Cost-Benefit Analysis:** - **Material Cost Premium:** +25-35% - **Testing Cost Reduction:** -50-70% - **Scrap Reduction:** -30-50% - **Weight Optimization:** 10-15% possible - **Total Cost Impact:** Positive for critical/high-volume applications --- ## **12. Special Notes** ### **Processing Limitations:** 1. Maximum section: ~115mm for through-hardening 2. Very high temper embrittlement susceptibility 3. Extremely poor weldability 4. Very limited toughness at high hardness ### **Metallurgical Considerations:** - Temper embrittlement range: 350-550°C - Retained austenite: 12-18% as-quenched - Secondary hardening peak: 475-525°C - Maximum austenitizing: 850°C --- **Technical Significance:** AISI 5155H represents the highest carbon grade in the 51xx H-series, offering maximum hardness potential with guaranteed consistency. Its primary value lies in applications where extreme wear resistance must be combined with predictable performance, particularly in regulated industries where material certification and traceability are mandatory. **Revision:** 1.1 **Date:** October 2023 **Disclaimer:** This technical data is for informational purposes. Actual properties depend on specific processing conditions. H-grade certification ensures hardenability consistency but does not eliminate the need for proper process control and application-specific testing for critical applications. -:- For detailed product information, please contact sales. -: AISI 5155H Steel Specification Dimensions Size： Diameter 20-1000 mm Length <4128 mm Size:We can customized as required Standard： Per your request or drawing We can customized as required Properties（Theoretical） Chemical Composition -:- For detailed product information, please contact sales. -: AISI 5155H Steel Properties -:- For detailed product information, please contact sales. -:

Applications of AISI 5155H Steel Seamless tube -:- For detailed product information, please contact sales. -: Chemical Identifiers AISI 5155H Steel Seamless tube -:- For detailed product information, please contact sales. -:

Packing of AISI 5155H Steel Seamless tube -:- For detailed product information, please contact sales. -: Standard Packing: -:- For detailed product information, please contact sales. -: Typical bulk packaging includes palletized plastic 5 gallon/25 kg. pails, fiber and Steel Seamless tube drums to 1 ton super sacks in full container (FCL) or truck load (T/L) quantities. Research and sample quantities and hygroscopic, oxidizing or other air sensitive materials may be packaged under argon or vacuum. Solutions are packaged in polypropylene, plastic or glass jars up to palletized 599 gallon liquid totes Special package is available on request. E FORUs’ is carefully handled to minimize damage during storage and transportation and to preserve the quality of our products in their original condition