AISI 51B60H 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 51B60H Steel Flange, annealed 815°C (1500°F) Product Information -:- For detailed product information, please contact sales. -: AISI 51B60H Steel Flange, annealed 815°C (1500°F) Synonyms -:- For detailed product information, please contact sales. -:

AISI 51B60H Steel, annealed 815°C (1500°F) Product Information -:- For detailed product information, please contact sales. -: ### **Product Datasheet: AISI 51B60H Steel, Annealed at 815°C (1500°F)** --- #### **1. Product & Process Overview** This specification defines **AISI 51B60H alloy steel**—a **hardenability-controlled, boron-treated grade**—that has undergone a **precise full annealing heat treatment at 815°C (1500°F)**, followed by slow furnace cooling. This process is engineered to produce a **fully spheroidized microstructure** while preserving the certified hardenability characteristics of the "H" grade. The result is a material that offers **exceptional machinability and formability** in its supplied state, coupled with **guaranteed and superior hardenability** for final heat treatment. This represents the premium starting condition for manufacturing complex components where maximum processability and absolute performance predictability are required. #### **2. Material & Specific Annealing Rationale** - **Base Material (AISI 51B60H):** A premium-grade steel combining **certified hardenability ("H" band per SAE J1268)** with **boron-enhanced hardenability**. The annealing process is carefully designed to soften the material without compromising these critical performance attributes. - **Significance of the 815°C (1500°F) Annealing Cycle:** 1. **Optimal Subcritical Spheroidization:** This temperature is strategically selected to operate within the ferrite + carbide (α + Fe₃C) phase field, **well below the lower critical temperature (Ac₁ ~730°C)**. This promotes the complete **coalescence of carbides into soft, globular spheroids** without austenite transformation. 2. **Preservation of Certified Hardenability:** The subcritical nature of this anneal preserves the boron distribution and microstructure factors that guarantee the "H" band hardenability. The certified Jominy response remains fully valid from this condition. 3. **Maximum Softness with Certification:** Achieves the **lowest possible hardness (typically 179-207 HBW)** for this grade while maintaining full traceability and performance certification. #### **3. International Standard & Specifications** - **Governing Standard:** **ASTM A304** - Standard Specification for Carbon and Alloy Steel Bars Subject to End-Quench Hardenability Requirements. - **Heat Treatment Reference:** This cycle aligns with standard spheroidizing annealing practices for guaranteed-hardenability steels. - **Material Reference:** **SAE J404** (Compositions) & **SAE J1268** (Hardenability Bands for 51B60H). - **Condition Standard:** **ASTM A29/A29M** (Annealed condition). - **UNS Designation:** **H51601** - **Common Procurement Spec:** **ASTM A304, Grade 51B60H, Annealed at 815°C (1500°F)**, typically noted as "Spheroidize Annealed". #### **4. Chemical Composition (% by Weight, per SAE J1268 for 51B60H)** *Chemistry is controlled within the "H"-band ranges to guarantee hardenability, with critical boron and titanium additions.* | Element | Content Range (%) | Role in the 815°C Annealing Cycle | | :--- | :--- | :--- | | **Carbon (C)** | **0.55 – 0.65** | Forms the spheroidal cementite particles; higher carbon requires this anneal for machinability. | | **Manganese (Mn)** | **0.70 – 1.05** | Provides solid solution strengthening; its range helps maintain the "H" band hardenability. | | **Phosphorus (P)** | **≤ 0.035** | Impurity; kept at minimum levels. | | **Sulfur (S)** | **≤ 0.040** | Impurity; kept at minimum levels. | | **Silicon (Si)** | **0.15 – 0.35** | Strengthens the ferrite matrix. | | **Chromium (Cr)** | **0.60 – 1.00** | Forms stable alloy carbides that spheroidize effectively. | | **Boron (B)** | **0.0005 – 0.003** | **Critical Performance Element.** Its hardenability-enhancing effect is preserved and fully active from this annealed state. | | **Titanium (Ti)** | **(Guaranteed addition)** | **Essential Boron Protectant**, ensuring boron efficacy through the annealing cycle. | | **Iron (Fe)** | **Balance** | Base metal; forms the soft, ductile ferrite matrix. | #### **5. Resulting Physical & Mechanical Properties** *Properties are for representative sections after complete 815°C spheroidize annealing.* **A. Microstructural Outcome:** - **Structure:** **Spheroidized Carbides** uniformly dispersed within a **soft Ferrite matrix**. - **Carbide Morphology:** Well-rounded, coarse globules (ASTM Spheroidize Rating 4-6). - **Grain Size:** ASTM 7-9 (Fine-grained ferrite). **B. Typical As-Annealed Mechanical Properties:** - **Hardness:** **179 – 207 HBW** (Approx. **88 – 95 HRB**). This is the **softest achievable state** for 51B60H. - **Tensile Strength:** **590 – 690 MPa** (86 – 100 ksi) - **Yield Strength (0.2% Offset):** **≥ 345 MPa** (50 ksi) - **Elongation in 50mm:** **≥ 22%** - **Reduction of Area:** **≥ 55%** - **Machinability:** **Excellent.** Rating **~80-85%** (relative to 1212 steel). The spheroidized structure produces short, broken chips, minimizes tool wear, and enables high-speed machining with superior surface finishes. **C. The Certified Hardenability (Post-Heat Treatment):** *Despite its soft state, the material retains its **certified SAE J1268 hardenability band for 51B60H**. After final austenitizing and quenching, it will exhibit the **guaranteed depth and uniformity of hardening**, with the boron providing additional enhancement. This ensures predictable transformation even after extensive cold work or machining.* #### **6. Key Characteristics & Value Proposition** - **Uncompromised Manufacturingility with Guaranteed Performance:** Offers the **best possible machinability** for this alloy system while maintaining **full hardenability certification**. This eliminates the traditional trade-off between processability and final properties. - **Ideal for Complex Manufacturing:** The soft, ductile state is perfect for **severe cold forming, cold heading, thread rolling, and intricate machining** operations that would be impossible or costly in harder conditions. - **Certified Consistency:** Provides the same lot-to-lot consistency in heat treatment response as normalized 51B60H, but with vastly improved manufacturability in the initial processing stages. - **Risk Reduction:** Eliminates uncertainty in both machining (excellent chip control, predictable tool life) and heat treatment (certified hardenability curve). #### **7. Typical Applications** This premium annealed condition is specified for the most demanding manufacturing applications: - **Complex Cold-Headed Fasteners:** **Grade 10.9/12.9 structural bolts, engine studs, and high-performance pins** requiring extensive cold work before heat treatment. - **Precision Automotive Components:** **Complex transmission gears, splined shafts, and steering components** that require heavy machining before hardening. - **Hydraulic Valve Bodies:** **Intricately ported valves and manifolds** needing extensive drilling and milling. - **Tooling & Die Preforms:** **Mold inserts, die blanks, and master hubs** machined to precise dimensions before final hardening. - **Spring Manufacturing:** **Wire for high-stress coil springs** that are formed in the soft state then heat treated. #### **8. Comparison with Other Conditions (51B60H)** | Condition | Process Temp | Hardness (HBW) | Primary Advantage | | :--- | :--- | :--- | :--- | | **Normalized (855°C)** | 855°C | 229-285 | Optimal pre-hardening strength; best for simple machining. | | **Annealed (815°C)** | **815°C** | **179-207** | **Maximum softness for complex forming/machining.** | | **As-Quenched & Tempered** | 830°C+ | 300-550+ | Final service properties. | #### **9. Ordering & Further Processing** - **Ordering Specification:** **"AISI 51B60H, Annealed at 815°C (1500°F), Spheroidize Annealed, to ASTM A304"**. - **Mandatory Certification:** The **Certified Material Test Report (CMTR) must include**: 1. Chemical analysis. 2. **Jominy Hardenability Test Results** proving SAE J1268 compliance. 3. Confirmation of the annealing cycle (815°C). 4. Hardness and mechanical properties from an annealed test coupon. - **Next Steps:** **This is exclusively a processing state.** All parts **must undergo final quenching and tempering** to achieve service properties. The annealing optimizes manufacturing; the "H" certification guarantees the hardening result. --- **Disclaimer:** The properties listed are for the **annealed, pre-hardened condition only. This material must be quenched and tempered before use in any load-bearing application.** The 815°C anneal provides optimal manufacturability; the "H" certification ensures predictable hardening. Final heat treatment must be designed using the supplied Jominy data. This premium material is justified when manufacturing complexity and performance certainty outweigh material cost considerations. -:- For detailed product information, please contact sales. -: AISI 51B60H Steel, annealed 815°C (1500°F) Specification Dimensions Size： Diameter 20-1000 mm Length <5181 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 51B60H Steel, annealed 815°C (1500°F) Properties -:- For detailed product information, please contact sales. -:

Applications of AISI 51B60H Steel Flange, annealed 815°C (1500°F) -:- For detailed product information, please contact sales. -: Chemical Identifiers AISI 51B60H Steel Flange, annealed 815°C (1500°F) -:- For detailed product information, please contact sales. -:

Packing of AISI 51B60H Steel Flange, annealed 815°C (1500°F) -:- 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 1652 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