Mould steel quality inspection program full resolution

Mold steel quality inspection program full resolution
⒈ macroscopic:
Macro inspection mould steel is not greater than with the naked eye or magnifying glass 10 times the steel surface under examination or cross-section, to determine the quality of steel and method of tissue defects. Macro-test method of sub-acid leaching test and fracture test in two ways.
⑴, acid leaching test:
Acid leaching test is used, the simplest macro-quality test. The hot acid leaching and acid leaching cold acid leaching, hot acid leaching can check the steel in the segregation, porosity, dendrite, such as white point and the hairline.
Acid leaching site should be representative samples, the sample taken must be the most serious defects in the ingot parts, ingot head, the tail is more centralized location of macro-defects. The general requirements of the mold can be sampled in the head near the riser, high quality requirements should be sampled at the same time the head and tail.
Mold steel working parts are generally in the center, so the steel center of higher density, osteoporosis should be carefully tested for the center, and have more stringent requirements. For the larger size of the mold, you should also check dendritic grain structure.
⑵, fracture test:
Fracture test is also an important means of macroeconomic analysis, can provide some visual evidence of damage to steel itself and mold found in the problem. Non-metallic inclusions, within the crack, bubbles, shrinkage, and osteoporosis can also be used to test the fracture.
By FB/T1299-2000 "alloy tool steel technology" specified in the standard: hot-rolled and forged steel, the surface may not have visible cracks, folds, scars, and mixed. If the defect must be removed, the depth of half the tolerance range of other minor surface defects from time to clear; cold-drawn steel surfaces should be clean, smooth, not cracked, folded, scarring, mixed and oxide. Heat-treated cold-drawn steel surface allows the color or slight oxidation oxide; delivery status of steel fracture organization should be uniform, fine grains, without visible shrinkage, inclusions, delamination, cracks, bubbles and white spots. According to the buyer requires, upon the agreement between and in the contract, the delivery status of steel to the low magnification acid leaching test. In the acid leaching test on-chip low power may not have visible shrinkage, inclusions, delamination, cracks, bubbles and white spots. Center porosity and ingot-based segregation in accordance with this standard 4-level figure assessment of its quality level by mutual agreement. Acid leaching low magnification inspection of steel, not to fracture test.

⒉ microstructure examination:
Microstructure control mold steel quality inspection is one of the means necessary. Chemical microscope or by other organizations under the microscope of steel, in accordance with relevant standards and regulations to determine the eligibility of quality and production processes or improve, and analyze some of the defects.
Metallographic examination should be a good representative sample. Observed cross-section of the interview sample taken from the edge to the center of major organizational changes, surface defects such as decarburization, oxidation, over-burning, folding, size of grain size determination, etc.; longitudinal samples taken mainly observed non-metallic inclusions, grain deformation the degree of band organization.
According to GB / T 1299-2000 "alloy tool steel and technical conditions" for the annealed state delivery 9SiCr, CrWMn other steel mesh should be tested pearlite and carbide, according to the standard to be assessed in the rating chart and control; on hot-pressure processing of steel mesh does not have to test pearlite and carbide. Annealed state of delivery Cr12, Cr12MoV, Cr12Mo1V1 (D2), 6W6Mo5Cr4V and 6Cr4W3Mo2VNb eutectic carbide steel should be uniformity test, according to the standard map in the graded level and control. Of hot-rolled and forged steel decarburization test, upon the agreement between group Ⅰ can supply. Of cold-drawn steel decarburization layer unilateral nominal size can not exceed 1.5% (not including silicon the size of its nominal 2%), silver steel surface does not allow decarburization layer, flat and cross-sectional size greater than 150mm total decarburization of steel by the agreement between the implementation.
According to the buyer requirements, alloy tool steel can increase the non-metallic inclusions, grain size and hardenability tests and other projects, the matrix test methods, sample number, and other rating criteria and qualified according to the agreement between levels of implementation.

HongChao(DongGuan) Mould & Technology Co.,Ltd. warm to remind you that the sales of imported high-quality tool steel, including: Swedish Uddeholm tool steelsIMPAX HH, STAVAX ESR, MIRRAX, CORRAX, ORVAR SUPREME, DIEVAR, QRO90, HOTVAR, SVERKER-21, SLEIPNER, VIKING, CALDIE, VANADIS 23, VANADIS 30, etc.; Sweden Assab Tooling steel 718HH, S136, 8407,8418, XW-42, ASSAB 88, VIKING, etc.; Japan Daido steel NAK80, NAK-PRM, PD613, S -STAR, 440C-ESR, DC53, DHA1, DHA-WORLD, DH31-EX, DRM1, DRM2, DRM3 etc.; Japan's Hitachi tool steel DAC, DAC55, YXR3, YXR33, SLD, ACD37, etc.; German Groditz tool steel 1.2711,1.2316,1.2344,1.2367,1.2379 etc.; Japan Fujikoshi high-speed steel SKH-9, HM35 (JIS SKH55), HM42 (JIS SKH59), HS93R (JIS SKH57), etc.; American Crucible powder tool steel CPM3V, CPM10V, CPMM4 etc. .

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Source: HongChao(DongGuan) Mould & Technology Co.,Ltd.
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