EN19 QT Round Bars: Specifications, Applications, and Sourcing in the UAE 

The mainstay of heavy-duty engineering and production in the UAE's major industries are EN19 QT (Quenched and Tempered) round bars. Comprehending this high-strength alloy steel is essential if you work on projects ranging from construction and power production to oil and gas. With more in-depth analysis and useful information than any other online resource, this comprehensive reference covers all you need to know about EN19 QT round bars, especially for the UAE market. 

What is EN19 QT Steel? Understanding the Grade and Heat Treatment 

High-grade nickel-chromium-molybdenum alloy steel EN19 is renowned for its remarkable strength, hardness, and resistance to wear. Importantly, the label "QT" stands for Quenched and Tempered. 

• Quenching: After being heated to a very high temperature, the steel bar is quickly cooled (quenched in water or oil). This process produces martensite, an extremely hard but fragile substance. 

• Tempering: After quenching, the bar is reheated to a lower temperature and kept there for a predetermined amount of time before cooling. By maintaining high strength and hardness while reducing brittleness, this meticulously regulated technique produces the ideal mix of mechanical qualities for demanding applications. 

Because of this combination, EN19 QT round bars perform better in high-stress situations than mild steel or regular carbon steels. 

What are EN19 QT Equivalent Grades? A Global Reference for UAE Engineers 

Understanding the corresponding grades is crucial for cross-referencing specifications and international projects. In the United Arab Emirates, where technical drawings may employ different standards, this is especially helpful. 

UAE-Specific Insight: Even though EN19 and 4140 are frequently used interchangeably in the area, it is always advisable to verify the precise chemical composition and mechanical qualities needed for your project because there may be minor differences. 

What are the Key Mechanical Properties of EN19 QT Round Bars? 

The properties can be tailored slightly based on the tempering temperature, but standard values are: 

• Tensile Strength: 850 - 1000 MPa 

• Yield Strength (0.2% Proof Stress): 650 MPa (Min) 

• Elongation: 13% (Min) 

• Impact Strength (Charpy V-Notch): 40 Joules (Min) 

• Hardness: 248 - 302 HB (Brinell Hardness) 

Because of these characteristics, it is perfect for parts that need to resist shock loading, fatigue, and high dynamic loads. 

Chemical Composition: Why It Matters? 

The performance of EN19 is dictated by its precise chemical recipe: 

What are Top Applications of EN19 QT Round Bars in UAE Industries? 

The industrial environment in the United Arab Emirates generates a significant demand for this adaptable substance. Important uses consist of: 

• Oil & Gas: Drill collars, gearboxes, mandrels, pump shafts, and valve parts for refineries and drilling rigs. 

• Construction & Heavy Equipment: Crankshafts, axles, pins, gears, and hydraulic rods for bulldozers, cranes, and excavators. 

• Power Generation: Wind turbines, generators, and gas turbines' gears, shafts, and fasteners. 

• Marine & Offshore: High-strength, harsh-environment-resistant parts for offshore platforms and ships. 

• Automotive: High-performance connecting rods, axles, and crankshafts for large machines and automobiles. 

• Plastic Injection Molding: Manufacturer of ejector pins and sturdy mold bases. 

What are the Advantages of Choosing EN19 QT Over Other Steels? 

• High Strength-to-Weight Ratio: Makes it possible to build lighter parts without compromising functionality. 

• Excellent Machinability (in annealed condition): Before the last heat treatment, it is simpler to machine into intricate designs. 

• Good Wear Resistance: Increases the moving parts lifespan. 

• Superior Toughness: Resists breaking when subjected to shock and impact loads. 

• Weldability (with precautions): Pre-heating and post-weld heat treatment techniques can be used to weld. 

Sourcing EN19 QT Round Bars in the UAE: Dubai, Abu Dhabi, Sharjah 

When procuring in the UAE, consider these critical factors to ensure quality and reliability: 

1. Material Certification: Always ask for a Certificate of Conformance (COC) or Mill Test Certificate (MTC). For the sake of traceability and quality control, this cannot be negotiated. 
2. Supplier Reputation: Select suppliers and stockists who have a track record of providing major UAE industries with authentic, approved products. 
3. Range of Sizes: To reduce waste and expenses, a reputable supplier should keep a large variety of diameters and lengths in stock. 
4. Value-Added Services: To save time and simplify logistics, look for vendors who provide cutting, machining, and heat treatment services. 
5. Local Stock: Faster delivery and less project delays are guaranteed by suppliers who have local UAE stock (for example, in Jebel Ali, Dubai Industrial City, or Mussafah, Abu Dhabi). 

Trusted EN19 QT Round Bar Suppliers in the UAE 

• Metal & Steel Suppliers in Dubai: JAFZA, or Jebel Ali Free Zone, is home to numerous important worldwide metal suppliers. 

• Specialized Steel Stockists in Mussafah, Abu Dhabi: For engineering and metal supply industries, Mussafah's industrial region is a crucial location. 

• Industrial Hardware Suppliers in Sharjah: There are many wholesalers in Sharjah's industrial regions. 

EN19 QT vs. EN24 vs. EN8: Which Alloy Steel Bar is Right for Your UAE Project? 

• EN8 (0.4% Carbon Steel): Steel with a modest carbon content. Excellent for general-purpose uses where extreme toughness and wear resistance are not essential, such as gears, shafts, and bolts. Compared to EN19 QT, it is much weaker yet less costly. 

• EN19 QT (Ni-Cr-Mo Steel): The topic of this piece. The ideal option for applications requiring exceptional strength and toughness under stress and dynamic loads. 

• EN24 QT (AISI 4340): It has even more strength and toughness than EN19 since it contains more nickel, especially in bigger cross-sections. It is frequently utilized for very important parts, including high-performance automotive parts and landing gear for airplanes. In general, it costs more. 

For UAE buyers: EN19 QT provides the ideal blend of performance and affordability if your component is subjected to high levels of stress, fatigue, or impact (such as in heavy machinery or oil fields). 

Frequently Asked Questions (FAQs) About EN19 QT Round Bars 

What is the price of EN19 QT round bars per kg in the UAE? 

Pricing fluctuates and is influenced by supplier margins, diameter, quantity, and steel pricing globally. Expect a range by 2023. Obtaining estimates from several UAE-based vendors is crucial for the most precise and affordable prices. 

Can EN19 QT bars be machined easily? 

They need carbide tools since they are extremely hard in their final QT condition. For large machines, it is preferable to buy the bar "annealed" (soft state), machine it, and then quench and temper it to obtain the desired final qualities. 

Is EN19 QT corrosion resistant?  

Because of its chromium concentration, it resists corrosion a little better than carbon steel, although it is not stainless. Components should be coated, plated, or specified in a separate, more corrosion-resistant grade for corrosive regions (such as the offshore United Arab Emirates). 

How do I verify the quality of the EN19 QT bars I receive? 

Demand that the Mill Test Certificate (MTC) be provided. For crucial applications, third-party testing can be carried out in a lab in Dubai or Abu Dhabi to confirm chemical composition (using a PMI gun) and hardness (using a portable Brinell tester). 

Dimensions:

OD 3mm - 460mm

20mm to 310mm x 6000mm

Finish:

Hot Rolled + Black Surface + QT 28-32HRC + UT C/c

Forged + Bright Surface + QT 28-32HRC + UT D/d 

Disclaimer
The information and data presented herein are typical or average values and are not a guarantee of maximum or minimum values. Applications specifically suggested for material described herein are made solely for the purpose of illustration to enable the reader to make his own evaluation and are not intended as warranties, either express or implied, of fitness for these or other purposes. There is no representation that the recipient of this literature will receive updated editions as they become available.