AISI 1345H 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 1345H Steel Flange Product Information -:- For detailed product information, please contact sales. -: AISI 1345H Steel Flange Synonyms -:- For detailed product information, please contact sales. -:

AISI 1345H Steel Product Information -:- For detailed product information, please contact sales. -: # Product Introduction: AISI 1345H Hardenability-Controlled High-Carbon Alloy Steel ## Overview **AISI 1345H** is the hardenability-controlled variant of AISI 1345 high-carbon manganese alloy steel. The "H" designation signifies that this material is manufactured to guaranteed hardenability limits as determined by end-quench (Jominy) testing. This grade combines the high strength and wear resistance potential of 1345 steel with the production consistency needed for critical applications where uniform heat treatment response across large production runs is essential. It is particularly valuable for components requiring high surface hardness and reliable core properties in larger cross-sections. ## 1. Chemical Composition AISI 1345H features controlled chemical composition with broader ranges for key elements to achieve specified hardenability bands while maintaining production flexibility. | Element | Content Range (% by weight) - AISI 1345H | |---------|------------------------------------------| | **Carbon (C)** | 0.42 - 0.48 | | **Manganese (Mn)** | 1.35 - 2.05 | | **Phosphorus (P)** | 0.035 max | | **Sulfur (S)** | 0.040 max | | **Silicon (Si)** | 0.15 - 0.35 | | **Iron (Fe)** | Balance | **Critical Features of H-Grade Chemistry:** - **Carbon Range:** 0.42-0.48% provides the basis for high hardness potential while allowing adjustment within the band to meet hardenability requirements - **Expanded Manganese Range:** 1.35-2.05% enables precise control of hardenability response across different section sizes - **Hardenability Focus:** Chemical composition may vary between heats while maintaining identical hardenability characteristics - **Consistency Priority:** The primary specification is the hardenability band, not fixed chemistry limits ## 2. Physical & Mechanical Properties ### A. Physical Properties (Approximate) - **Density:** 7.85 g/cm³ (0.284 lb/in³) - **Elastic Modulus:** 200-210 GPa (29,000-30,500 ksi) - **Poisson's Ratio:** 0.29 - **Thermal Conductivity:** 45.8 W/m·K at 100°C - **Specific Heat Capacity:** 476 J/kg·K at 100°C - **Coefficient of Thermal Expansion:** 11.7 × 10⁻⁶/°C (20-200°C) - **Electrical Resistivity:** 0.23 μΩ·m at 20°C ### B. Mechanical Properties (Heat Treated Condition) **Typical Properties After Proper Heat Treatment:** | Property | As-Quenched (Oil) | Tempered @ 200°C | Tempered @ 400°C | Tempered @ 600°C | |----------|-------------------|------------------|------------------|------------------| | **Hardness (HRC)** | 58-62 | 55-58 | 45-48 | 30-35 | | **Tensile Strength (MPa)** | 2100-2300 | 1950-2100 | 1400-1550 | 900-1050 | | **Yield Strength (MPa)** | 1600-1800 | 1550-1700 | 1250-1400 | 750-900 | | **Elongation (%)** | 5-8 | 8-10 | 12-15 | 18-22 | | **Reduction Area (%)** | 15-25 | 25-35 | 40-50 | 50-60 | | **Charpy Impact (J)** | 10-15 | 15-20 | 30-40 | 60-80 | **Hardenability Characteristics (Jominy Test Data):** The guaranteed hardenability band ensures consistent performance: - **Surface Hardness:** 58-62 HRC at Jominy distance 1/16" - **Core Hardness:** Predictable hardness at specified Jominy distances - **Critical Diameter (50% martensite):** Approximately 50-75 mm (2-3") in oil quench - **Through-Hardening Capability:** Suitable for sections up to 75 mm diameter ## 3. International Standards & Equivalent Grades | Standard/Country | Equivalent Designation | Specification/Note | |------------------|-----------------------|---------------------| | **SAE (USA)** | **SAE 1345H** | SAE J1268 (Hardenability Bands) | | **ASTM (USA)** | **ASTM A304** | Carbon and Alloy Steel Bars Subject to End-Quench Hardenability | | **UNS** | **H13450** | Unified Numbering System | | **ISO** | **- (See Note 1)** | Refer to ISO 683-18 hardenability steel classification | | **DIN (Germany)** | **- (See Note 2)** | No direct H-equivalent; 46Mn7 is compositional equivalent | | **EN (Europe)** | **- (See Note 2)** | European standards focus on composition, not H-bands | | **JIS (Japan)** | **- (See Note 2)** | SMn443 is similar but without Hardenability guarantee | | **GB (China)** | **45Mn2H** | Chinese hardenability-controlled equivalent | **Notes:** 1. ISO 683-18 provides a system for hardenability steels but not direct grade-for-grade equivalents 2. The "H" designation and guaranteed hardenability bands are primarily North American practices 3. When sourcing internationally, specify hardenability requirements rather than relying on grade names ## 4. Product Applications ### Available Product Forms: - **Hot-rolled bars:** Rounds (20-200 mm diameter), squares, flats - **Cold-finished bars:** Ground and polished for precision applications - **Forging stock:** Billets and blooms for closed-die forging - **Wire rod:** For cold forming of high-strength components ### Primary Industry Applications: #### **Automotive & Heavy Vehicle Manufacturing** - **Heavy-Duty Axle Shafts:** For trucks and buses requiring uniform strength - **Transmission Components:** Gears, shafts, and splines in heavy transmissions - **Suspension Components:** Torsion bars, heavy-duty spring elements - **Steering Parts:** Pitman arms, drag links, steering arms #### **Industrial Machinery & Equipment** - **Gear Manufacturing:** Medium to large gears requiring consistent hardness - **Drive Shafts:** Main power transmission shafts in industrial machinery - **Hydraulic Components:** High-pressure cylinder rods and piston rods - **Agricultural Machinery:** Combine harvester shafts, tractor transmission parts #### **Construction & Mining Equipment** - **Undercarriage Components:** Track pins, bushings, roller shafts - **Drill Rig Components:** Shafts and rotating elements in drilling equipment - **Earth Moving Parts:** Bucket pins, linkage components #### **Specialized Applications** - **High-Strength Fasteners:** Critical bolts and studs requiring consistent properties - **Tooling Components:** Jigs, fixtures, and die components - **Wear-Resistant Parts:** Components subject to abrasion and impact ## 5. Heat Treatment Characteristics ### Guaranteed Hardenability Performance: AISI 1345H provides predictable heat treatment response: - **Consistent Jominy Curve:** Certified hardenability band for each heat - **Reduced Distortion:** Uniform transformation reduces warpage - **Predictable Properties:** Mechanical properties can be accurately predicted for any section size within the specified range ### Recommended Heat Treatment Cycle: **1. Austenitizing:** - Temperature: 815-830°C (1500-1525°F) - Soak time: 30 minutes per inch of thickness minimum - Atmosphere control recommended to prevent decarburization **2. Quenching:** - Medium: Fast oil (preferred) or polymer quenchant - Agitation: Moderate to severe for maximum uniformity - Temperature: 40-60°C (100-140°F) for oil quench **3. Tempering:** - **Immediate Tempering:** Within 2 hours of quenching - **Temperature Range:** 150-650°C (300-1200°F) based on requirements - **Time:** 1-2 hours per inch, minimum 2 hours - **Double Tempering:** Recommended for highest toughness and stability **4. Special Processes:** - **Induction Hardening:** Excellent response, surface hardness 58-62 HRC - **Nitriding/Carbonitriding:** For enhanced surface properties - **Stress Relieving:** After rough machining, before final heat treatment ## 6. Fabrication & Processing ### **Machinability:** - **Annealed Condition:** 55-60% of B1112 (hardness 187-229 HB) - **Hardened Condition:** Requires carbide tools and reduced speeds - **Recommended Practices:** - Use sharp tools with positive rake angles - Adequate cooling/lubrication essential - Consider pre-hardened machining at 28-32 HRC for better chip control - Speeds: 30-60 SFM for turning, 20-40 SFM for drilling ### **Weldability:** **Rating: Very Poor (extreme precautions required)** - **Preheat Temperature:** 300-400°C (570-750°F) minimum - **Interpass Temperature:** Maintain 250-350°C (480-660°F) - **Post-Weld Heat Treatment:** Mandatory immediate stress relief - **Recommended Processes:** GTAW with pre/post heat - **Filler Metals:** Austenitic stainless steel (309/310) or nickel-based alloys - **Applications:** Generally not recommended for welded fabrication; repair welding only with extreme caution ### **Forging:** - **Temperature Range:** 1150-850°C (2100-1560°F) - Start at upper temperature, finish above 850°C - Slow cooling after forging (furnace cool or buried in lime/vermiculite) - Full anneal after forging before machining ### **Grindability:** - Good grindability in hardened condition - Use aluminum oxide or CBN wheels - Proper cooling to prevent grinding burns - Consider fine-grit wheels for best surface finish ## 7. Quality Assurance & Testing ### Standard Certification Includes: 1. **Hardenability Report:** Actual Jominy test results with heat-specific curve 2. **Chemical Analysis:** Heat analysis and product verification 3. **Dimensional Reports:** For precision-ground materials 4. **Surface Quality:** Freedom from defects per specified standards ### Optional Testing: - Ultrasonic testing for internal quality - Magnetic particle inspection for surface defects - Macroscopic examination for grain flow and soundness - Mechanical testing from representative samples ## 8. Design & Engineering Considerations ### **Advantages of 1345H:** 1. **Predictable Performance:** Guaranteed hardenability reduces heat treatment variables 2. **Consistent Quality:** Uniform properties across production batches 3. **Design Reliability:** Engineers can design with confidence in material response 4. **Reduced Scrap:** Fewer heat treatment-related rejections 5. **Process Control:** Simplified heat treatment procedures ### **Limitations:** 1. **Cost Premium:** Higher cost than standard 1345 2. **Specialized Supply:** Limited availability from certain suppliers 3. **Welding Difficulty:** Very poor weldability limits fabrication options 4. **Quench Sensitivity:** Careful quenching practices required to avoid cracking ### **Economic Considerations:** - **Justification:** The cost premium is justified by reduced scrap, consistent quality, and improved part performance - **Total Cost:** Consider total manufacturing cost including heat treatment, inspection, and warranty - **Volume Applications:** Most economical for medium to high production volumes ## Summary **AISI 1345H** represents the premium, consistency-engineered version of high-carbon manganese alloy steel. By specifying the "H" variant, manufacturers gain unprecedented control over heat treatment outcomes, ensuring that critical components achieve the intended mechanical properties consistently across all production batches. This material is particularly valuable for: - **Safety-critical components** where failure is not an option - **High-volume production** requiring consistent quality - **Complex geometries** where uniform hardening is challenging - **Applications** requiring predictable fatigue life and reliability The guaranteed hardenability bands transform AISI 1345 from a material with potential into a material with predictable performance. While requiring careful handling in welding and heat treatment, AISI 1345H offers manufacturers the confidence that comes with material consistency, making it the preferred choice for demanding applications in automotive, heavy equipment, and industrial machinery sectors where performance reliability cannot be compromised. -:- For detailed product information, please contact sales. -: AISI 1345H Steel Specification Dimensions Size： Diameter 20-1000 mm Length <4005 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 1345H Steel Properties -:- For detailed product information, please contact sales. -:

Applications of AISI 1345H Steel Flange -:- For detailed product information, please contact sales. -: Chemical Identifiers AISI 1345H Steel Flange -:- For detailed product information, please contact sales. -:

Packing of AISI 1345H Steel Flange -:- 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 476 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