4140HW Alloy Steel Technical Data 4140HW meets AISI4140 standards and has improved hardenability and strength in heavier cross-sections.

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1 4140HW Alloy Steel Technical Data 4140HW meets AISI4140 standards and has improved hardenability and strength in heavier cross-sections. Alloy Description TimkenSteel s 4140HW grade is a fine-grained, low-alloy steel that offers optimum heat-treat response in heavier cross-sections. You find 4140HW in a variety of bar and tubing applications in quenched and tempered conditions. Yield strengths range from 110 ksi through 140 ksi, but we can temper it to other strength levels. When compared with standard 4140 heat treated to the same tensile and yield strengths, 4140HW achieves significantly higher toughness, as measured by impact strength (see Figure 9). 4140HW combines medium carbon content with high-end chromium, molybdenum, and manganese contents to improve hardenability. We add trace amounts of vanadium to increase temper resistance. Other residual elements are also added, but controlled within AISI4140 standard limits. A grain structure enhances toughness at all strength levels. We produce 4140HW using the electric-arc furnace method. After the melting process, we transfer the molten steel to a ladle refiner for alloy adjustments and vacuum de-gassing. By performing argon stirring under a near-perfect vacuum, we remove impurities and harmful gases. This melting and refining process path reduces levels of tramp elements such as phosphorus and sulfur. A subsequent calcium treatment spheroidizes remaining manganese sulfides. The melt-and-refine approach optimizes strength and toughness properties in both the longitudinal and transverse directions of the final product. After refining the steel, we teem it into large bottom-poured ingot molds or continuously cast into large blooms. We can roll these ingots or blooms into solid rounds for machining and forging or for conversion into seamless mechanical tubing. Alloy Type Hardenable, low alloy steel. Typical Applications Oil and gas drilling and completion equipment such as packers, liner hanger components, drilling jars and fishing tools.

2 Procedure and Results Chemistry C Mn Si Cr Ni Mo Typical 4140HW Typical AISI 4140 Standard Limits 0.38/ / / / / 0.25 Physical Properties Value (units) Density lb/in 3 (7.85 g/cm 3 ) Thermal Conductivity Specific Heat Thermal Expansion Coefficient Modulus of Elasticity 296 BTU-in/hr-ft 2 -ºF (0.106 cal-cm/s-cm 2 -ºC) at 212ºF (100ºC) Btu/lb/ F (0.16 cal/g/ C) at ºF (50-100ºC) µin/in-ºf ( µm/m-k) at ºF (20-100ºC) 29.7 x 10 3 ksi (205 GPa) Poisson s Ratio 0.29 Mechanical Properties Hardness See Figure 1 Tensile See Figure 2 and Figure 3 Charpy V-notch Impact See Figure 5 and Figure 6 Heat Treatment Normalize Quench and Temper Temperatures F ( C), Forced air cool prior to harden/temper Austenitize F ( C), Liquid quench, Temper to desired strength

3 Hardenability Jominy Hardenability See Figure 10 CCT/IT phase transformations See Figure 7 and Figure 8 Workability Hot Forgability Forge up to 2250 F (1230 C) Other Properties High-Temperature Properties See Figure 4

4 Figure 1 (Hardness vs. Tempering) This data generated in a laboratory shows the effect of tempering temperature on midwall hardness for 1.25" and 2" wall tubing. Austenitized at 1625 F (885 C) and water quenched. Soak time of approximately 60 minutes at temper temperature. Figure 2 (Strength vs. Tempering) This data generated in a laboratory shows the effect of tempering on strength for 1.25" and 2" wall tubing. Austenitized at 1625 F (885 C) and water quenched. Soak time of approximately 60 minutes at temper temperature.

5 Figure 3 (Ductility vs. Tempering) This data generated in a laboratory shows the effect of tempering on the elongation and reduction of area for 1.25" and 2" wall tubing. Austenitized at 1625 F (885 C) and water quenched. Soak time of approximately 60 minutes at temper temperature. Figure 4 (Hot Tensile) This data generated in a laboratory shows high temperature strength of 4140HW for 1.25" - 2" wall tubing. Austenitized at 1625 F (885 C) and water quenched.

6 Figure 5 (L-CVN vs. Tempering) This data generated in a laboratory shows the effect of tempering on the longitudinal impact energy (Charpy V-Notch) for 1.25" and 2" wall tubing tested at -4 F. Austenitized at 1625 F (885 C) and water quenched. Soak time of approximately 60 minutes at temper temperature. Figure 6 (T-CVN vs. Tempering) This data generated in a laboratory shows the effect of tempering on the transverse impact energy (Charpy V-Notch) for 1.25" and 2" wall tubing tested at +32 F. Austenitized at 1625 F (885 C) and water quenched. Soak time of approximately 60 minutes at temper temperature.

7 Figure 7 (CCT Curve) Predicted isothermal and continuous cooling transformation diagrams for 4140HW calculated with Thermo-Calc. Figure 8 (CCT Curve) Predicted isothermal and continuous cooling transformation diagrams for 4140 calculated with Thermo-Calc.

8 Figure 9 (Mechanical Properties for 4140 and 4140HW) The data represents a mechanical property comparison of several 4140 and 4140HW heats. Figure 10 (Jominy Hardenability Curve for 4140 and 4140HW) The data represents an average of Jominy results from several 4140 and 4140HW heats. For more information, visit or call us at (USA), +44 (0) (Europe), +52 (55) (Latin America) and +86 (21) (China) :29 Order No TimkenSteel is a registered trademark TimkenSteel Corporation. Printed in U.S.A.