T8ARound steel bar
t8aIsCarbon Tool Steel, Standards areGB/T 1298-2008After quenching and tempering, it exhibits high hardness and wear resistance, but has low hot hardness, poor penetration, tendency to deform, and lower plasticity and strength.Used for various tools requiring high hardness and wear resistance, such as simple molds and punches, cutting tools for metal, drilling tools, woodworking planers, countersinks, axes, chisels, hand saws, and assembly tools for fitters, as well as minor tools like rivet punches.
Refer to the corresponding steel grade
ChinaGBStandard Steel GradeT8；我国台湾CNSStandard Steel GradeSK5/SK6JapanJISStandard Steel GradeSK5/SK6GermanyDINStandard Material Steel Grade1.1625GermanyDINStandard Steel GradeC80W2United KingdomBSStandard Steel Grade060A67/060A72FranceAFNORStandard Steel GradeY170FranceNFStandard Steel GradeC80E2USwedenSSStandard Steel Grade1778United StatesAISI/SAEStandard Steel GradeW1A-8RussiaTOCTStandard Steel GradeY8South KoreaKSStandard Steel GradeSTC5/STC6；International Standards OrganizationISO StandardsSteel gradeTC80。
ChinaGBStandard Steel GradeT8A; USAUNSStandard Steel GradeT72301;GermanyDINStandard Steel GradeC80W1GermanyDINStandard Material Steel Grade1.1525FranceNFStandard Steel GradeC80E2URussiaTOCTStandard Steel GradeY8A。
T8AChemical Composition
Carbon C ：0.75～0.84
Silicon Si：≤0.35
Manganese Mn：≤0.40
Sulfur S ：≤0.020
Phosphorus P ：≤0.030
Chrome CrPermitted residue content ≤0.25、≤0.10(Manufacturing lead-bath quenched wire steel)
Nickel NiPermitted residue content ≤0.20、≤0.12(Manufacturing lead bath quenching steel wire)
Copper CuPermitted residual content ≤0.30、≤0.20(In the process of manufacturing lead-bath quenching steel wire)
Note: Allowable residue contentCr+Ni+Cu≤0.40(Manufacturing lead-bath quenching steel wire) [1]
T8AMechanical properties
Hardness Annealing,≤187HB,Diameter≥4.40mm;Quenching,≥62HRC
Heat Treatment Specifications
Heat Treatment Specification: Sample Quenching780～800℃,Water-cooled.
Shipment Status
Steel is delivered in annealed condition. Alternatively, delivery without annealing can be agreed upon by both parties.
Typical Application Examples
1For making integrated unitsM12Bolt cold heading die, quenching hardness57-59HRC, lifespan up to6000Piece.
2Used for manufacturing cold heading dies for truck body bolts, φ8.9*90mm同心圆柱体, with internal cavity water quenching, forming a surface hardening layer that enhances fatigue resistance, lifespan up to2Over 10,000 times without water quenching.Cr12MoVSteel lifespan only1000-2000Next.
3Used for making willow nail molds, hardness after quenching51-53HRCMold life greater than7000Pieces, and the hardness is either too high or too low after quenching, leading to a reduced lifespan.
4Used for making punches, after ultra-fine carbide treatment and low-temperature quenching, the lifespan of the punch can be increased tenfold compared to conventional quenching treatment.
5Indentation and relief molds used for manufacturing general stretch molds, select hardness for the relief mold when making the convex mold.58-62HRCSelect hardness for mold making60-64HRC。
6Small-sized, simple-shaped cold working dies with light loads, such as small punches, shearing machine blades, and upsetting dies requiring shallow hardening layers while maintaining high toughness.
7The steel punch undergoes a carbide micro-refinement process followed by low-temperature quenching, significantly reducing cracking and extending the mold's lifespan.10Multiple.
