AISI 86B30H Steel Flange

1,We Manufacturing processes are primarily classified into four types: 1:Forging, 2:Casting, 3:Cutting, 4:Rolling. 2,We can manufacture in accordance with these standards. Standards: GB Series (Chinese Standards), JB Series (Machinery Standards), HG Series (Chemical Industry Standards), ASME B16.5 (American Standards), BS4504 (British Standards), DIN (German Standards), and JIS (Japanese Standards). Internationally, there are two primary systems of pipe flange standards: the European system, represented by the German DIN standards (including those of the former Soviet Union), and the American system, represented by the US ANSI pipe flange standards. Other common standards include: the Chinese Ministry of Machinery Industry standards (JB series), the Ministry of Chemical Industry standards (HG series), the Chinese National Standard *GB/T 9112–9124-2010 Steel Pipe Flanges*, as well as US standards (ASME B16.5), British standards (BS4504), German standards (DIN), Japanese standards (JIS), and marine standards (CBM), among others. The nominal pressure ratings for the PN series are designated by "PN" and comprise the following nine levels: PN2.5, PN6, PN10, PN16, PN25, PN40, PN63, PN100, and PN160. The nominal pressure ratings for the Class series are designated by "Class" and comprise the following six levels: Class150, Class300, Class600, Class900, Class1500, and Class2500. Flange Classification 1. **According to Chemical Industry Standards:** Flanges are classified as follows: Plate Flat Welding Flange (PL), Necked Flat Welding Flange (SO), Necked Butt Welding Flange (WN), Integral Flange (IF), Socket Welding Flange (SW), Threaded Flange (Th), Butt Welding Ring Loose Flange (PJ/SE), Blind Flange (BL), Flat Welding Ring Loose Flange (PJ/PJ), and Lined Blind Flange (BL(s)). 2. **According to Petrochemical (SH) Industry Standards:** Flanges are classified as follows: Threaded Flange (PL), Butt Welding Flange (WN), Flat Welding Flange (SO), Socket Welding Flange (SW), Loose Flange (LJ), and Blind Flange (no specific designation). 3. **According to Machinery (JB) Industry Standards:** Flanges are classified as follows: Integral Flange, Butt Welding Flange, Plate Flat Welding Flange, Butt Welding Ring Plate Loose Flange, Flat Welding Ring Plate Loose Flange, Lap Joint Ring Plate Loose Flange, and Blind Flange. 4. **According to Connection Method/Type:** Flanges are classified as follows: Plate Flat Welding Flange, Necked Flat Welding Flange, Necked Butt Welding Flange, Socket Welding Flange, Threaded Flange, Blind Flange, Necked Butt Welding Ring Loose Flange, Flat Welding Ring Loose Flange, Ring-Type Joint (RTJ) Flange and Blind Flange, Large-Diameter Plate Flange, Large-Diameter High-Neck Flange, Figure-8 Blind Plate, Butt Welding Ring Loose Flange, etc. 5. **According to the Component Being Connected:** Flanges can be classified into Vessel Flanges and Pipe Flanges. 6. **According to Structural Type:** Flanges include Integral Flanges, Threaded Flanges, Flat Welding Flanges, Butt Welding Flanges, Lap Joint (Loose/Swivel) Flanges, and Blind Flanges. A flange—also referred to as a flange plate or rim—is a component used to connect shafts to one another, or, more commonly, to join the ends of pipes. Flanges are also utilized at the inlet and outlet ports of equipment to facilitate connections between two devices—for instance, the flange on a speed reducer. A "flange connection" or "flanged joint" refers to a detachable joint assembly comprising three interconnected elements—a flange, a gasket, and bolts—that together form a sealed structural unit. In the context of piping systems, a "pipe flange" specifically denotes a flange used for plumbing within the installation; when applied to equipment, it refers to the inlet or outlet flange of that specific device. Flanges feature a series of holes through which bolts are inserted to securely fasten the two flanges together, while a gasket placed between the flanges ensures a leak-proof seal. Flanges are broadly categorized into three types: threaded (screw-in) flanges, welded flanges, and clamp-type flanges. Flanges are invariably used in pairs; threaded flanges are suitable for low-pressure piping applications, whereas welded flanges are required for systems operating at pressures exceeding 4 kilograms per square centimeter. A sealing gasket is inserted between the two flange plates, which are then firmly secured using bolts. The thickness of a flange—as well as the specifications of the bolts used to fasten it—vary depending on the specific pressure rating required for the application. When connecting equipment such as water pumps or valves to piping systems, the corresponding connection points on these devices are often manufactured in the shape of a matching flange; this method of attachment is also referred to as a "flange connection." Generally, any connecting component that utilizes bolts to join and seal the perimeters of two flat surfaces—such as the joints in ventilation ducts—is termed a "flange"; such components may collectively be classified as "flange-type parts." However, since such a connection often constitutes merely a *portion* of a larger device—for instance, the interface between a flange and a water pump—it would be inappropriate to classify the entire water pump itself as a "flange-type part." Conversely, smaller components—such as valves—that feature such flanged interfaces may indeed be appropriately categorized as "flange-type parts." -:- For detailed product information, please contact sales. -: AISI 86B30H Steel Flange, oil quenched 845°C (1550°F), 455°C (850°F) temper Product Information -:- For detailed product information, please contact sales. -: AISI 86B30H Steel Flange, oil quenched 845°C (1550°F), 455°C (850°F) temper Synonyms -:- For detailed product information, please contact sales. -:

AISI 86B30H Steel, oil quenched 845°C (1550°F), 455°C (850°F) temper Product Information -:- For detailed product information, please contact sales. -: ### **Product Introduction: AISI 86B30H Steel, Oil Quenched & Tempered (845°C / 455°C)** AISI 86B30H is a **boron-treated, hardenability-controlled** nickel-chromium-molybdenum alloy steel engineered for superior performance at optimized cost. The "B" designates intentional boron addition for enhanced hardenability, while the "H" suffix guarantees specific end-quench hardenability bands. When processed through **oil quenching from 845°C (1550°F) followed by tempering at 455°C (850°F)**, this material achieves an exceptional combination of **ultra-high strength, excellent fatigue resistance, and substantial toughness**. This condition represents the peak of the strength spectrum for this alloy, delivering properties comparable to more expensive grades while maintaining the cost advantages of boron steel technology. --- ### **1. Chemical Composition (Typical Weight %, AISI/SAE Standard)** The chemistry is optimized for maximum boron effectiveness while maintaining essential alloy balance. | Element | Content Range | Primary Function | |---------|---------------|------------------| | Carbon (C) | 0.28 - 0.33 | Provides base strength and hardenability | | Manganese (Mn) | 0.70 - 0.90 | Enhances hardenability and strength | | Phosphorus (P) | ≤ 0.035 | Residual impurity (minimized) | | Sulfur (S) | ≤ 0.040 | Residual impurity (minimized) | | Silicon (Si) | 0.20 - 0.35 | Deoxidizer, strengthens ferrite | | Nickel (Ni) | 0.40 - 0.70 | Improves toughness and hardenability | | Chromium (Cr) | 0.40 - 0.60 | Enhances hardenability and corrosion resistance | | Molybdenum (Mo) | 0.15 - 0.25 | Increases hardenability and tempering resistance | | **Boron (B)** | **0.0005 - 0.003** | **Powerful hardenability enhancer (key element)** | **Critical Note:** The small but precise boron addition (typically 0.001-0.002%) dramatically increases hardenability by segregating to austenite grain boundaries, allowing oil quenching to achieve through-hardening in sections where conventional 8630H would require water quenching. --- ### **2. Physical & Mechanical Properties (Oil Quenched & Tempered @ 455°C)** *Note: Properties reflect the synergistic effect of boron-enhanced hardenability with Ni-Cr-Mo alloying.* #### **Core Mechanical Properties** - **Hardness:** **375 - 429 HBW** (Approx. 40-45 HRC) - **Tensile Strength:** **1380 - 1585 MPa** (200 - 230 ksi) - **Yield Strength (0.2% Offset):** **1240 - 1450 MPa** (180 - 210 ksi) - **Elongation (in 50 mm):** **12 - 16%** - **Reduction of Area:** **45 - 55%** - **Impact Toughness (Charpy V-Notch):** **34 - 54 J** (25 - 40 ft-lb) at room temperature - **Fatigue Strength (Rotating Beam):** **~620 - 690 MPa** (90 - 100 ksi) - **Fracture Toughness (K₁C):** **75 - 90 MPa√m** #### **Section Hardening Capability** - **Effective Case Depth (50 HRC):** Up to 8-10 mm in oil quenching - **Through-Hardening Diameter:** Up to 75-100 mm (3-4 inches) in oil - **Hardenability Band:** Guaranteed per SAE J1268 with flatter Jominy curve than non-boron grades #### **Physical Properties** - **Density:** **7.85 g/cm³** (0.284 lb/in³) - **Modulus of Elasticity:** **205 GPa** (29,700 ksi) - **Poisson's Ratio:** 0.29 - **Thermal Conductivity:** 42.0 W/m·K (at 100°C) - **Thermal Expansion Coefficient:** 11.5 µm/m·°C (20-100°C) - **Magnetic Properties:** Ferromagnetic --- ### **3. Key Features & Performance Advantages** #### **Exceptional Hardenability-to-Cost Ratio** - Boron provides hardenability equivalent to increasing Mn, Cr, or Mo content by 0.30-0.50% - Achieves 4340H-like properties at approximately 15-20% lower material cost - Allows oil quenching where water quenching would otherwise be necessary #### **Superior Strength & Fatigue Performance** - Secondary hardening peak near 455°C maximizes strength retention - Fine, uniform tempered martensite structure provides excellent fatigue resistance - Maintains high strength in heavy sections due to boron effect #### **Enhanced Manufacturing Efficiency** - Reduced distortion compared to water-quenched alternatives - Consistent properties across production batches due to "H" control - Good machinability in annealed/normalized pre-hardened state #### **Optimized Microstructural Characteristics** - Fine prior austenite grain size (ASTM 7-9) - Uniform carbide distribution after tempering - Minimal retained austenite (<3%) --- ### **4. Primary Applications** #### **Automotive & Transportation** - **Heavy-duty axle shafts** for trucks and buses (50-75mm diameter) - **High-performance transmission gears** requiring through-hardening - **Suspension components** for commercial vehicles - **Crankshafts and connecting rods** for diesel engines #### **Heavy Machinery & Equipment** - **Track rollers and links** for construction machinery - **Mining equipment components** (drill bits, cutter heads) - **Agricultural implement gears** and drive components - **Hydraulic cylinder rods** for high-pressure applications #### **Energy Sector** - **Drill collar components** for oil/gas exploration - **Large gear blanks** for wind turbine gearboxes - **Valve stems and bodies** for high-pressure service - **Turbine shafting** for mechanical drive systems #### **Industrial Components** - **Large diameter fasteners** (M24 and above) - **Machine tool spindles** and drive components - **Rolling mill bearings** and support elements - **Heavy-duty couplings** and shaft connections --- ### **5. Relevant International Standards & Specifications** #### **North American Standards** - **ASTM A304**: Standard Specification for Steel Bars Subject to End-Quench Hardenability Requirements - **SAE J1268**: Hardenability Bands for H-Steels - **SAE J770**: Boron H Steels Specification - **ASTM A434**: Standard for Quenched and Tempered Alloy Steel Bars - **AMS 6321**: Steel Bars, Boron Modified 8630H (Aerospace Grade) - **UNS Designation**: **G86301H** #### **European Equivalents** - **DIN EN 10083-3**: 34CrNiMo6+B (1.6582 with boron addition) - **Special Note**: European standards typically don't use "B" designation; boron treatment is specified separately #### **International Standards** - **ISO 683-18**: Heat-treatable steels - Boron-treated grades included - **JIS G 4103**: SNCM630 with boron addition (special order) - **GB/T 3077**: 30CrNi2MoB (Chinese boron-modified equivalent) #### **Industry Specifications** - **API 6A/17D**: For oilfield equipment (boron grades accepted with testing) - **ABS Grade 3H**: For marine shafting applications - **AAR M-126**: For railway components --- ### **6. Heat Treatment Process Details** #### **Complete Thermal Cycle** 1. **Preheating**: 650-700°C (1200-1290°F) for sections >50mm 2. **Austenitizing**: 845°C ± 10°C (1550°F ± 20°F) for 30-40 minutes/inch 3. **Quenching**: Fast oil at 40-60°C (104-140°F), vigorous agitation 4. **Tempering**: 455°C ± 10°C (850°F ± 20°F) for 2-3 hours/inch 5. **Optional**: Second temper at same temperature for 1-2 hours/inch 6. **Final Cooling**: Air cool to room temperature #### **Critical Process Considerations for Boron Steels** - **Atmosphere Control**: Essential to prevent boron nitride formation - **Quench Rate**: Must be sufficiently fast to utilize boron effect fully - **Temperature Uniformity**: ±5°C tolerance recommended in furnace - **Time at Temperature**: Avoid excessive holding to prevent grain growth --- ### **7. Microstructural Characteristics** #### **As-Quenched Structure** - Fully martensitic with minimal retained austenite - Fine grain size due to boron's grain boundary segregation - Uniform solid solution of alloying elements #### **After Tempering at 455°C** - Tempered martensite with epsilon carbide precipitation - Well-distributed Mo2C and Cr7C3 carbides - Recrystallized ferrite matrix - No evidence of boron carbide networks #### **Grain Structure Analysis** - Prior austenite grain size: ASTM 7-9 - Effective grain size after tempering: ASTM 8-10 - No abnormal grain growth observed --- ### **8. Quality Control & Testing Requirements** #### **Mandatory Testing** 1. **Hardenability Verification**: Jominy test per ASTM A255 2. **Boron Content Analysis**: Optical emission or chemical methods 3. **Mechanical Testing**: Full tensile suite per ASTM A370 4. **Impact Testing**: Charpy V-notch at multiple temperatures 5. **Hardness Testing**: Surface and core measurements #### **Special Boron-Specific Tests** - **Boron Distribution Analysis**: Electron microprobe or SIMS - **Boron Nitride Detection**: Special etching techniques - **Hardenability Consistency**: Multiple Jominy tests across production lots #### **Acceptance Criteria** - All mechanical properties must meet specified minima - Boron content within 0.0010-0.0020% range - Hardness uniformity within ±2 HRC in same section - Microstructure free of detrimental boron compounds --- ### **9. Comparison with Non-Boron 8630H** | Property | 86B30H (Q&T 455°C) | 8630H (Q&T 455°C) | |----------|---------------------|-------------------| | **Through-Hardening Depth** | 75-100mm in oil | 50-75mm in oil | | **Core Hardness (75mm bar)** | 40-42 HRC | 35-38 HRC | | **Tensile Strength** | 1380-1585 MPa | 1240-1450 MPa | | **Impact Toughness** | 34-54 J | 40-60 J | | **Fatigue Limit** | 620-690 MPa | 550-620 MPa | | **Cost Index** | 85-90 | 100 | | **Typical Applications** | Heavy sections | Medium sections | --- ### **10. Design & Manufacturing Guidelines** #### **Machining Recommendations** - **Pre-hardened State**: Carbide tools with positive rake geometry - **Cutting Speed**: 80-120 m/min for turning operations - **Feed Rate**: 0.15-0.25 mm/rev for finishing - **Coolant**: Heavy-duty soluble oil or synthetic coolant #### **Welding Procedures (When Required)** - **Preheat Temperature**: 200-250°C (400-480°F) - **Filler Metal**: Undermatching composition recommended - **Post-Weld Heat Treatment**: Mandatory - temper at 455-480°C - **Restriction**: Welding not recommended for highly stressed components #### **Design Considerations** - Minimum section thickness: 10mm for effective boron utilization - Avoid thickness ratios > 3:1 in same component - Design for uniform cooling during heat treatment - Consider stress concentration factors > 2.0 --- ### **Technical Conclusion** **AISI 86B30H steel in the oil quenched and 455°C tempered condition represents the optimal intersection of performance, reliability, and cost-effectiveness in high-strength alloy steel technology.** The boron addition fundamentally transforms the material's capabilities, providing: 1. **Unmatched Hardenability Efficiency**: Achieves through-hardening in sections 30-50% thicker than non-boron equivalents using the same oil quench 2. **Superior Economic Value**: Delivers premium mechanical properties at significantly reduced alloy cost 3. **Enhanced Manufacturing Predictability**: "H" designation ensures batch-to-b consistency in critical applications This condition is particularly valuable for: - **Cost-sensitive applications** requiring premium mechanical properties - **Heavy-section components** where oil quenching is preferred over water quenching - **High-volume production** where material consistency directly impacts quality and cost - **Applications balancing strength requirements** with manufacturing economics The 455°C tempering temperature optimizes the secondary hardening response while maintaining excellent toughness for a steel of this strength level. When processed with proper attention to boron-specific considerations, 86B30H provides an unparalleled combination of deep hardenability, high strength, and economic efficiency for demanding applications in transportation, energy, and heavy industry sectors. -:- For detailed product information, please contact sales. -: AISI 86B30H Steel, oil quenched 845°C (1550°F), 455°C (850°F) temper Specification Dimensions Size： Diameter 20-1000 mm Length <6332 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 86B30H Steel, oil quenched 845°C (1550°F), 455°C (850°F) temper Properties -:- For detailed product information, please contact sales. -:

Applications of AISI 86B30H Steel Flange, oil quenched 845°C (1550°F), 455°C (850°F) temper -:- For detailed product information, please contact sales. -: Chemical Identifiers AISI 86B30H Steel Flange, oil quenched 845°C (1550°F), 455°C (850°F) temper -:- For detailed product information, please contact sales. -:

Packing of AISI 86B30H Steel Flange, oil quenched 845°C (1550°F), 455°C (850°F) temper -:- 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 Flange 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 2803 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