ASTM T4 Tool Steel / 1.3255 / S 18-1-2-5 / SKH3

AISI T4 tool steel is one of tungsten type high speed tool steel, which belongs to ASTM A600 specification, the standard for high speed tool steel materials.

فولاد ابزار ASTM T4 is similar to T1 Tool Steel materials, but with 4.25~5.75% cobalt added to increase heat resistance. The red hardness of T4 steel and the high temperature hardness is a little higher than T1 tool steel. AISI T4 tool steel is a deep hardening alloy capable of Rockwell C 64 hardness.

Otai Steel is one of the leading supplier of AISI/ASTM T4 tool steel high speed materials. We know the features of T4 high speed steel materials and different applications & your various applications. You have the T4 tool steel materials data below.

1.ASTM/AISI T4 Tool Steel Supply Range

T4 نوار گرد فولادی: قطر 2mm - 200mm
T4 فولاد تخت: ضخامت 2-20mm x عرض 10-100mm
ورق فولادی T4: ضخامت 2-200mm x عرض 200-810mm
سطح نهایی: مشکی ، ماشین آلات خشن ، چرخانده یا مطابق با شرایط مورد نیاز.

2.Relevant Steel Specifications of AISI T4 High Speed Tool Steels

کشور	ایالات متحده	آلمانی	ژاپن
استاندارد	ASTM A600	ISO 4957	JIS G4403
درجات	T4 / T12004	S 18-1-2-5/1.3255	SKH3

3.AISI T4 Tool Steel and Equivalents’ Chemical Composition

ASTM A600	C		Mn		P	S	Si		Cr		V		W		Mo		Co
T4	0.70	0.80	0.10	0.40	0.03	0.03	0.20	0.40	3.75	4.50	0.80	1.20	17.50	19.00	0.40	1.00	4.25	5.75
DIN ISO 4957	C		Mn		P	S	Si		Cr		V		W		Mo		Co
S 18-1-2-5/1.3255	0.75	0.83	...	0.40	0.03	0.03	...	0.45	3.80	4.50	0.80	1.20	17.50	18.50	0.50	0.80	4.50	5.50
JIS G4403	C		Mn		P	S	Si		Cr		V		W		Mo		Co
SKH3	0.73	0.83	...	0.40	0.03	0.03	...	0.45	3.80	4.50	0.80	1.20	17.00	19.00	...	...	4.50	5.50

4.High Speed Steel T4 Tool Steel Mechanical Properties

• خصوصیات بدنی فولادهای ابزار T4 با سرعت بالا
  • Physical properties (average values) at ambient temperature
  • Modulus of elasticity [103 x N/mm2]: 217
  • Density [g/cm3]: 8.70
  • هدایت حرارتی [W / mK]: 19.0
  • Electric resistivity [Ohm mm2/m]: 0.65
  • ظرفیت حرارتی خاص [J / gK]: 0.46

• Mechanical Properties of T-4 Steel

خواص	متری	امپراتوری
مدول الاستیسیته	190-210 GPa	27557-30458 ksi
نسبت پواسون	0.27-0.30	0.27-0.30

• Thermal Properties of T4 Tool Steels

خواص	متری	امپراتوری
Thermal expansion co-efficient	11.9 µm/m°C	6.6 µin/in°F

5.Forging از مواد فلزی ابزار ASTM T4

Forging of T4 steel can be carried out from 850 to 1120°C (1775 to 2100°F).

• Preheat T4 steel material uniformly and slowly to 860-880°C.
• Increase the forging temperature up to 1050-1120°C.
• T4 hss tool steel should be cooled very slowly after forging.

6.AISI/ASTM T4 Tool Steel Heat Treatment and Properties

• استحکام سیستم عامل ها

Harden T4 high speed tool steel from a temperature of 1260-1290oC followed by oil, air quenching or warm bath at 550oC. Hardness after quenching is 63-66 HRC.

• آنیل

T4 steel should be annealed after hot working. Increase the temperature of T4 high speed steel to 860°C(Max220°C per hour). Hold at the temperature and then cool slowly with the furnace. The annealed hardness achieved should be below HB255.

• خستگی

Tempering temperature: 2x 560-580oC. Hardness after tempering is 64-65 HRC.

7.Applications of ASTM / AISI T4 Steel Steel

AISI T4 high speed tool steels are widely used as cutting tools, broaches and cold extrusion punches, turning, planing and milling cutters for roughing work.

برنامه های معمولی عبارتند از:

• آموزش
• فرزهای برش ،
• ابزارهای برش موضوع ،
• ابزارهای Knurling ،
• مشت های اکستروژن سرد
• بروچس و غیره

Besides of ASTM/AISI T4 high speed tool steel materials, we are also capable of supplying T1 high speed steel, T10 tool steels, T15 tool steel etc. Just contact us for more details and latest price offer. If you have any questions, also leave a comment below.