Hardened Tempered Martensitic Stainless Steel Strips

Baomit offers hardened and tempered martensitic stainless steel strips, sheets & plates in grade 420J2, 440A, 440B and 440C. Martensitic stainless steel is a type of stainless steel that is well known for its strength, corrosion resistance, and durability. These qualities make martensitic stainless steel a good choice for a variety of applications, like automotive, machinery parts, and saw blades, for products typically subjected to harsh environments and demanding applications.

Parameters	Recommendation
Thickness Tolerance	T1 – T5
Roughness	Class 1 – 3
Flatness	Class 1 – 4
Surface	Bright / White / Blue / Yellow Polished
Edges	Deburring, Square, Round
Hardness	41 – 57 HRC
Thickness	0.10 – 4.50 mm
Width	3 – 460 mm
Steel Grade	420J2, 440A, 440B, 440C

Hardened Tempered Stainless Steel Strips

Our Advantages

• Excellent fatigue resistance

• Excellent punching and stamping properties

• Precise thickness and width tolerances

• Maximum straightness deviation of 1mm/3m

• Good surface finish

• Consistent, uniform microstructure

Steel Grades

Comparison of Norms
USA / AISI	EU / EN	Chemical Composition
420J2	X30Cr13	C: 0.26-0.40, Si: max 1.0, Mn: max 1.0, Ni: max 0.60, P: max 0.04, S: max 0.03, Cr: 12.0-14.0
440	X6Cr13	C: 0.60-1.20, Si: max 1.0, Mn: max 1.0, Ni: max 0.60, P: max 0.04, S: max 0.03, Cr: 16.0-18.0, Mo: max 0.75

Manufacture Process

• Cold Rolling

• Slitting

• Heat Treatment

• Surface Polishing

• Edging

• Packaging

Thickness Tolerances

Thickness (mm)	Tolerances ± mm
Thickness (mm)	T1	T2	T3	T4	T5
0.020 – 0.040	0.004	0.003	0.002	–	–
0.040 – 0.100	0.006	0.005	0.004	0.003	0.002
0.100 – 0.125	0.007	0.005	0.004	0.003	0.002
0.125 – 0.160	0.009	0.006	0.005	0.004	0.003
0.160 – 0.200	0.010	0.007	0.005	0.004	0.003
0.200 – 0.250	0.011	0.008	0.006	0.004	0.003
0.250 – 0.400	0.015	0.011	0.008	0.006	0.004
0.400 – 0.600	0.020	0.014	0.010	0.007	0.005
0.600 – 0.800	0.023	0.017	0.012	0.008	0.006
0.800 – 1.000	0.027	0.019	0.013	0.009	0.007
1.000 – 1.250	0.034	0.024	0.017	0.012	0.008
1.250 – 1.600	0.039	0.028	0.020	–	–
1.600 – 1.750	0.046	0.033	0.023	–	–

Width Tolerances

Thickness (mm)	Width (mm)	Tolerances ± mm
Thickness (mm)	Width (mm)	W1	W2	W3
≤0.25	≤50	0.10	0.07	0.05
	50 – 125	0.15	0.11	0.07
	>125	0.20	0.15	0.10
0.25 – 0.50	≤50	0.15	0.11	0.07
	50 – 125	0.20	0.15	0.10
	>125	0.25	0.20	0.15
0.50 – 1.00	≤50	0.20	0.15	0.10
	50 – 125	0.25	0.20	0.15
	>125	0.30	0.25	0.15
1.00 – 1.60	≤50	0.20	0.15	0.10
	50 – 125	0.30	0.25	0.15
	>125	0.35	0.25	0.20
1.60 – 1.75	≤50	0.30	0.20	0.15
	50 – 125	0.35	0.30	0.20
	>125	0.40	0.30	0.20

Surface Roughness

Available in bright, white, blue and yellow polished.

Thickness (mm)	Roughness
Thickness (mm)	Class 1	Class 2	Class 3
≤0.50	Ra≤ 0.30 µm Rt≤ 3.00 µm	Ra≤0.25 µm Rt≤ 2.50 µm	Ra≤ 0.20 µm Rt≤ 2.00 µm
0.50 – 1.00	Ra≤ 0.35 µm Rt≤ 3.50 µm	Ra≤ 0.25 µm Rt≤ 2.50 µm	Ra≤ 0.20 µm Rt≤ 2.00 µm
1.00 – 1.75	Ra≤ 0.40 µm Rt≤ 4.00 µm	Ra≤ 0.30 µm Rt≤ 3.00 µm	Ra≤ 0.30 µm Rt≤ 3.00 µm

Flatness Deviation

Maximum flatness deviation per inch strip width.

Thickness (mm)	Flatness Deviation
Thickness (mm)	Class 1	Class 2	Class 3	Class 4
0.02 – 0.10	P60	P50	P40	P30
0.10 – 0.25	P50	P40	P30	P20
0.25 – 0.50	P40	P30	P20	P10
0.50 – 1.75	P35	P25	P15	P10

Straightness Deviation

Strip Width (mm)	Measured Length (3m)
Strip Width (mm)	Class 1	Class 2	Class 3
≤50	3 mm	2 mm	1 mm
50 – 125	3 mm	2 mm	1 mm
>125	3 mm	2 mm	1 mm

Hubei Baomit Steel Materials Co., Ltd.

Industry leading manufacturer of cold rolled hardened tempered steel strips. Baomit strip steel stands for precision, quality and high performance. Our materials are excellent in terms of comprehensive delivery indicators, such as straightness, flatness, mechanical properties and metallographic uniformity.

Hardened Tempered Martensitic Stainless Steel Strips