Product Description

The general characteristic of honing tube production is that the honing of the tube material before cold deformation and until the accumulated cold deformation reaches a certain level, in order to eliminate work hardening and other needs, a series of cold deformation must be carried out before honing the tube product. For preparation work, there are many processes for honing the tube; the honing tube material usually undergoes many cold deformations from being put into production to being processed into a finished product. Moreover, the entire production process of the honing tube often includes multiple production cycles consisting of preparation and deformation processes. Reciprocating, the honing tube has a long production cycle, and the metal consumption of the honing tube is large; the honing tube equipment is mostly a single arrangement, and the honing tube is generally produced intermittently.

30CrMo, alloy structural steel . Unified digital code: A30302.Grade: 30CrMo Standard: GB/T 3077-1988

Introduction

Implementation standard:

Chromium-molybdenum alloy steel, which is a kind of alloy steel in China , 30 refers to the carbon content, and it is used to make high-strength bolts of 10.9S and 8.8S . However, it must be tested before use to confirm the content of its ingredients before you can use it with confidence. Chinese grade 30CrMO is equivalent to Japanese SCM430.

chemical composition

30crmo

(Quality Score) (%)

C：0.26～0.34

Si ： 0.17 ～ 0.37

Mn：0.40～0.70

Cr：0.80～1.10

Mo 0.15 0.25

P：≤0.035

S：≤0.035

By ≤ .0.030

With ： ≤0.030

Mechanical properties

Tensile strength σb (MPa): ≥930(95)

Yield strength σs (MPa): ≥785(80)

Elongation δ5 (%): ≥12

Area shrinkage ψ (%): ≥50

Impact energy Akv (J): ≥63

Impact toughness αkv (J/cm2): ≥78(8)

Hardness: ≤229HB

Sample size: sample blank size is 25mm

Microstructure

Heat treatment specification: quenching at 880℃, water cooling, oil cooling; tempering at 540℃, water cooling, oil cooling.

delivery status

Delivered with heat treatment (normalizing, annealing or high temperature tempering) or without heat treatment, and the delivery status should be specified in the contract.

heat treatment

Annealing annealing No.1 "760±10℃ annealing, furnace cooling to 400℃ air cooling.

HB220-230

Normalize normalize No.4 860±10℃ normalizing, air-cooled.

Quenching+tempering No.5 840±10℃ quenching water or oil (depending on the complexity of the product shape), tempering at 680-700 degrees. HB<217

Quenching+tempering No.6 quenching oil at 840±10℃, and then tempering at 470℃. HRC41-45

Quenching+tempering No.7 quenching oil at 840±10℃, and then tempering at 480℃. HRC35-45

Quenching+tempering No.8 Quenching oil at 850°C, and then tempering at 510°C. HRC38-42

Quenching+tempering No.9 quenching oil at 850℃, and then tempering at 500℃. HRC40-43

Quenching+tempering No.10 Quenching oil at 850℃, and then tempering at 510℃. HRC36-42

Quenching+tempering No.11 Quenching oil at 850℃, and then tempering at 560℃. HRC32-36

Quenching+tempering No.12 Oil quenching at 860°C, and then tempering at 390°C. HRC48-52

Main features

This steel has high strength and toughness , high hardenability , and the critical hardenable diameter in oil is 15-70mm; the hot strength of the steel is also good, with sufficient high temperature strength below 500 °C, but at 550 °C The strength decreases significantly; when the alloying elements are at the lower limit, the welding is quite good, but when the alloying element is close to the upper limit, the weldability is moderate, and it needs to be preheated to above 175 ℃ before welding; the machinability of the steel is good, and the plasticity during cold deformation is moderate ; The range of ~350°C has the first type of temper brittleness ; there is a tendency to form white spots.

Application examples

This kind of steel is usually used in a quenched and tempered state, and when the carbon content is the lower limit, it can also be used as a carburized steel that requires higher core strength . In the medium-sized machinery manufacturing industry, it is mainly used to manufacture quenched and tempered parts with large cross-sections that work under high stress conditions, such as shafts, spindles, and high-load steering wheels, bolts, stud bolts, gears, etc.; in the chemical industry It is used to manufacture welded parts, welded structures composed of plates and pipes , and high-pressure conduits whose temperature does not exceed 250°C in a medium containing nitrogen and hydrogen; in the steam turbine and boiler manufacturing industries, it is used to manufacture fasteners that work below 450°C, Flanges and nuts under high pressure below 500°C are especially suitable for making pipes under 300 atmospheres and 400°C.

Product display

FAQ
Q:What is your terms of payment?
A:We usually accept T/T in advance, L/C for large sum.If you prefer other payments terms, please discuss.

Q:What is the terms of delivery?
A:EXW, FOB, CIF

Q:What is the terms of packing?
A:Generally, we pack our goods in bundles or coils with rods or belts, we could also pack the goods as the customers' requirements.

Q:What is your delivery time?
A:For products in stock, we can ship it within 7 days after receiving the deposit.For custom order, production time is 15-30
workdays after received the deposit.

Q:Could you produce according to the samples?
A:Yes, we could customer-made by your samples or technique drawings, we could build the mold and fixtures.

Q:Can I place an sample order and what is your MOQ if I accept your quality?
A:Yes, we can send you samples but you may pay the express fees, our MOQ is 1 ton.

Q:How could you guarantee your products?
A:We accept and support the third-party inspection.We also could issue the warranty to customer to guarantee the quality.

Q:Where is the port of shipment?
A:Ningbo or Shanghai sea port.

Q:How can I get the price of needed product?
A:It's the best way if you can send us the material, size and surface, so we can produce for u to check the quality.If you
still have any confusion, just contact us, we would like to be helpful.