• DIN 668 round bar
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DIN 668

We can produce DIN 668 stainless steel round rods, DIN 668 forging,sheet,coil,and profiledstrip,Deformed steel,flat steel,mould,steel wire,have all specifications. With DuoNian production experience, strict control DIN 668 chemical composition and DIN 668 mechanical properties.From casting, forging, steel to hot and cold rolling process, heat treatment, etc, we have the control of professional engineers. We have advanced precision machining equipment, according to the requirements of users machining. in order to achieve the most satisfied with the user requirements.

Production specification

Round bar steel: 1mm to 3500mm
Square-shape steel: 1mm to 4000mm
Plate steel:0.1mm to 4000mm
Width: 10mm to 2500mm
Lenth: We can supply any lenth based on the customer's requirement.
Forging: Shafts with flanks/pipes/tubes/slugs/donuts/cubes/other shapes
Tubings: OD: φ6-1800mm, with wall thickness ranging from 1-35 mm.
Finished goods condition: hot forging/hot rolling + annealing/normalizing + tempering/quenching + tempering/any conditions based on the customer's requirement
Surface conditions: scaled (hot working finish)/ground/rough machining/fine machining/based on the customer's requirement
Furnaces for metallurgical processing: electrode arc + LF/VD/VOD/ESR/Vacuum consumable electrode.
Ultrasonic inspection: 100% ultrasonic inspection for any inperfections or based on the customer's requirementExcellent service for all kinds of industries,with advantages of technologies, equipment and price.
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1 basic information

Material: alloy tool steel

Grade: 5CrMnMo

Standard: GB/T 1299-1985

 hardness: 44 ~ 48

Applications: suitable for die forging hammer manufacturing medium length ≤ 400mm is hot cutting die.

2 characteristics

The steel is hot work die steel, except the hardenability, thermal fatigue resistance is poor,performance similar to 5CrNiMo steel with 5CrMnMo steel, hardenability slightly worse. This steel forforging die of various types of production requirements with high strength and high wear resistance. Requires higher toughness, electroslag remelting can be used steel.

3 chemical composition:

Carbon C:0.50 ~ 0.60
Si:0.25 ~ 0.60

Mn:1.20 ~ 1.60

S: S ≤ 0.030

P: P ≤ 0.030

Cr:0.60 ~ 0.90

Ni Ni: allows residual content ≤ 0.25

Cu: allows the residual copper content ≤ 0.30

Mo, Mo:0.15 ~ 0.30

4 mechanical properties

Hardness: annealing, 241 ~ 197HB, the indentation diameter of 3.9 ~ 4.3mm

5 heat treatment

Specification: heat treatment quenching, 820 ~ 850 ℃ oil cooling.

Tempering use heating temperature / ℃ heating medium hardness (HRC)

Eliminate stress, stable structure and size

Heat treatment process of 5CrMnMo steel are shown in table 3-1-3. Heat processing table 3-1-3 of 5CrMnMo steel

The project of heating temperature / ℃ temperature / C / C cooling end temperature

Ingot

Billet 1140 ~ 1180

1100 11501100 1150

1050 1100850 800

850 ~ 800 (slow cooling pit or cold)

Slow cooling (pit or cold)

Note: the steel after forging, should be slow cold. Large die forging, need to be placed in thermalinsulation to 600 ℃ oven, until the internal external temperature agreement,

Then furnace cooled to 150 to 200 DEG C, and then remove the empty cold.

Quenching specification 6 recommendation:

The quenching temperature / ℃ medium temperature / ℃ cooling hardness (HRC)

820 ~ 850 oil 150 ~ 180 to 150 ~ 180 ℃ mould cooling air, large and medium-sized mold immediatelytempering at 52 ~ 58

Note: 1 medium-sized forging die with heating temperature upper limit, lower limit of small die withheating temperature;

2 in order to reduce the mold after quenching stress and deformation, quenching the best first coldair to 740 ~ 760 ℃, then oil cooling, cooling to 150 ~ 180 ℃, remove and immediately annealing;

7 die

The small die 490 ~ 510 and 41 ~ 47 gas or electric stove

Medium-sized forging die 520 ~ 54038 ~ 41

Swallowtail Part II forging die

The small die 600 ~ 620 and 35 ~ 39 gas or electric stove

Medium-sized forging die 620 ~ 64034 ~ 37

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