We supply low cobalt ss bars, hexagonal bar and ss plates.

Low Cobalt Stainless Steel Bar (0Cr18Ni10Ti)
OD: 65 ± 0.1 mm
L: 1500 ± l mm
Shape: Round bar

Low Cobalt Stainless Steel Bar (0Cr18Ni10Ti)
OD: 40 ± 0.1 mm
L: 1500 ± 1mm
Shape: Round bar

Low Cobalt Stainless Steel Bar (0Crl8Nil0Ti)
OD: 11.2 ± 0.02 mm
L: 1500 ± 1mm
Shape: Round bar

Low Cobalt Stainless Steel Hexagonal Bar (0Cr18Nil0Ti)
9.2 x 8 x 1500mm
Bar section shape: Hexagonal

Low Cobalt Stainless Steel Plate (0Crl8Nil0Ti)
W x L x T = 1200 x 2400 x 15mm

» Material Specifications (SS-321 Bars)

Material Name: Low Cobalt Stainless Steel Bars
Material Grade: 0Cr18Ni10Ti
Product Condition: Hot Rolled, Solution Heat Treated & Straightened

Manufacturing Conditions:
The ingots for manufacturing the steel bars can be melted by electric arc furnace process or other refining process.
After being hot rolled (for steel bars with diameter less than 20mm, cold-drawn or roll after being hot-rolled is allowed), the steel bar shall be performed solution and picking or grinding (or lathing) treatment, and then be straightened.
The recommended temperature of solution treatment shall be in the range of (980-1050)°C.

Chemical Composition (wt %):

Element	C	Si	Mn	P	S	Fe
Content	≤0.08	≤1.0	≤2.0	≤0.035	≤0.03	Rest
Element	Ni	Cr	Ti	Co	N	--
Content	9.0-12.0	17.0-19.0	≥5C	≤0.05	≤0.037	--

Dimensions:

Outer Dia. (mm)	Length (mm)
Ø40 ± 0.1	1500
Ø1l.2 ± 0.02 Straightness = 0.25/500 mm Ra = 1.6 μm	1500
Ø65 ± 0.l	1500

Note: Flatness, and permissible variation in dimensions shall be in accordance with ASTM A 484 (GB 702)

Mechanical Properties:
Mechanical properties in transverse direction in finished rolled bars:

Temperature	Tensile Strength Rm(MPa)	Yield Strength Rp0.2(MPa)	Elongation in 50mm A (%)	Reduction in Area z (%)
At R.T	≥520	≥205	≥40	≥50
350°C	≥330	≥135	≥30

Metallography:

Microscopic Structure:
    i) Grain Size ≥ grade 4
    ii) Inclusion (Sulfide): ≤ grade 1.5
                       (Alumina): ≤ grade 1.5
                       (Silicate): ≤ grade 1.5
                       (Globular Oxide): ≤ grade 1.5
                       (Titanium Nilride): ≤ grade 2.5

Macroscopic Structure:
    i) General Porosity, Central Porosity & Segregation ≤ grade 1
    ii)After acid etching and macroscopic structure inspection, there shall be free of visible shrinkages, air bubbles, cracks, vacancies, pinholes and inclusions to exist in the steel bar specimen.

Intergranular Corrosion Resistance Property:
Sample sensitization at 650℃ for 2 hrs. No Intergranular attack

Non-Destructive Testing:

    i) Visual Inspection
        The surfaces of steel bars shall be free of defects such as cracks, folds, scabs and inclusions.
        The injurious surface defects can be removed by grinding; but after the grinding, the minimum diameter of steel bars shall be assured.

    ii) Ultrasonic Testing
        The steel bars shall be 100% examined by ultrasonic. The acceptance criteria shall be as following:
        a) For Single Defect:
        The bars with single defect of which the amplitude of echo signal exceeds that of Flat Bottom Hole (FBH) with diameter of 1.5mm with same beam path will be rejected.
        b) For Multiple Defects:
        The bars with multiple defects of which the amplitude of echo signal exceeds 10% of that of FBH with diameter of 1.5mm with same beam path and interval distance between defects is less than 25mm shall be rejected.
        c) Noise Signal Level of Steel Bar:
        If the amplitude of the noise signal exceeds 10% of that of FBH with diameter of 1.5mm with same beam path, the bar shall be rejected.
        d) Check of Back Reflection of Bar:
        Adjust device to make the amplitude of back reflection signal obtained from the standard specimen bar is as 80% as full screen height, then put the search unit on steel bar to check the loss of back reflection signal. If the amplitude of back reflection signal is less than 50%, the bar shall be rejected.

Certifications:

• Solid Solution Heat Treatment Regime
• Melting Furnace Number, Heat Treatment Furnace Number, Lot Number, Dimension and Weight
• Chemical Composition
• Dimensional Inspection
• Tensile Testing ,
• Metallographic Examination
• Intergranular Corrosion
• Surface Quality Inspection
• Ultrasonic Examination
• Results of Retest (if any)

Re-Examination:

In sampling tests, if the results of the specimens fail to meet the requirements or any item, double specimens shall be taken and retested for that item.
Lot will be rejected in case re-examination is not qualified.

Packaging & Delivery Conditions:

    • Packaging and marking shall be in accordance with GB/T 2101.
    • Packing container must indicate:
      Contract No., Size, Lot No., Net and Gross Weight, Quantity and Supplier Identification

Applicable Standards:

GB/T 222	GB/T 4334
GB/T 223	GB/T 4338
GB/T 226	GB/T 6394
GB/T 228	GB/T 10561
GB/T 1979	GB/T 20066
GB/T2101	PC8-FA-305TC

» Material Specifications (Hexagonal Bar)

1. Material Name: Low Cobalt Stainless Steel Hexagonal Bar
2. Material Grade: 0Cr18Ni1oTi
3. Product Condition: Hot Rolled, Solution Treated & Straightened
4. Manufacturing Conditions:
The stainless steel bar shall be made by electric arc furnace or other refining process.
The steel bars shall be solution treated, pickled and straightened after hot rolling.

5. Chemical Composition (wt %):

Element	C	Si	Mn	P	S
Content	≤0.08	≤1.0	≤2.0	≤0.035	≤0.03
Element	Ni	Cr	Ti	Co	Fe
Content	9.0-13.0	17.0-19.0	≥5C	≤0.05	Rest

6. Dimensions:

Dimension 9.2 x 8(±0.l) x 1500 mm
Straightness 0.25mm / 300mm
Surface Finish Ra 1.6 μm
Quantity  As per attached List

7. Mechanical Properties:

Tensile properties aficr age-treating at 593℃ for 4 hrs:

Temperature	Tensile Strength Rm(MPa)	Yield Strength RP0.2(MPa)	Elongation in 50mm A (%)	Reduction in Area Z (%)
At R.T	≥520	≥205	≥40	≥50
350℃	≥330	≥135	≥30

Testing Procedure:
Tension test shall be performed for each product batch, made up of the bars having same melting heat number, the same heat treatment number and the same dimensions.

8. Metallography:

Microscopic Structure:
    i) Grain Size ≥ grade 4
   ii) Inclusion) (Sulfide): ≤ grade 2
                       (Oxide):   ≤ grade 1
                       (Nitride):  ≤ grade 2.5

Macroscopic Structure:
    i) General Porosity & Central Porosity ≤ grade 1
    ii) After acid etching and macroscopic structure inspection, it should be free from visible shrinkage cavity, bubble, crack, hole, pinhole and non-metallic inclusions.

9. Intergranular Corrosion Resistance Property:

Sample sensitization at 650℃ for 2 hrs. No Intergranular attack

10. Non-Destructive Testing:

    i) Visual Inspection 100%
        The surface of the bar shall be inspected for crack,lap, scab, inclusion and other surface defects.
    ii) Ultrasonic Testing
The steel bars shall be 100% examined by ultrasonic. I'hc acceptance criteria shall be as following:
    a) The steel bar must be free of cracks and concentrated defects.
    b) Inspection shall be carried out by taking Ø1.5mm as the equivalent defect.

11. Certification Required:

AH the requisite testing / processing certification to ensure that the material meets specification, but not less than mentioned certifications:

• Solid Solution Heal Treatment Regime
• Chemical Composition
• Dimensional Inspection
• Tensile Testing
• Metallographic Examination
• Intergranular Corrosion
• Surface Quality Inspection
• Ultrasonic Examination
• Results of Rcicst (if any)

12. Re-Examination:

In sampling tests, if the results of the specimens fail to meet the requirements for any item, double specimens shall be taken and retested for that item.
Lot will be rejected in case re-examination is not qualified.

13. Packaging & Delivery Conditions:

    • Packing container must indicate:
Contract No., Size, Lot No., Net and Gross Weight, Quantity and Supplier Identification

14. Applicable Standards:

GB 4162 ASTM E 112/GB 6394
ASTM A 751 / GB 222 & GB 223 ASTM A 370/GB 228
ASTM E 340 / GB 226 ASTM A 555/GB 1220
ASTM E45/GB 10561 ASTM E 21 / GB 4338
ASTM A 484 /GB 702 ASTM A 262/GB 4334.5
ASTM A 700/GB 2101

» Material Specifications (SS-321 Plates)

1. Material Name: Low Cobait Slainless Steel Plalcs
2. Material Grade: 0Cr18Ni10Ti
3. Product Condition: Hot Rolled
4. Manufacturing Conditions:
The ingots for manufacturing the steel plates can be melted by electric arc furnace process or other refining process.
After being hot-rolled, the steel plate shall be performed solution and pickling treatment, and then flatted.
The recommended temperature of solution treatment shall be in the range of (980-1050)°C.

5. Chemical Composition (wt %):

Element	C	Si	Mn	P	s	Fe
Content	≤0.08	≤1.0	≤2.0	≤0.035	≤0.03	Rest
Element	Ni	Cr	Ti	Co	N	—
Content	9.0-13.0	17.0-19.0	≥5C	≤0.05	≤0.037

6. Dimensions:

i)

Length: 2400mm Width: 1200mm

Thickness: 15mm

Quantity: As per list attached

Note: Flatness. Straightness and permissible variation in dimensions shall be in accordance with ASTM A 480 (GB 4237)

7. Mechanical Properties:
Mechanical properties in transverse direction in finished rolled plates:

Temperature	Tensile Strength (Min) Rm(MPa)	Yield Strength (Min) Rp0.2 (MPa)	Elongation in 50mm (Min) A (%)	Reduction in Area (Min) Z(%)	Hardness* (Max)
					Brinell	Rockwell (B)
At R.T	≥520	≥205	≥40	≥50	217	95
350°C	≥345	≥135	≥30		--	--

* Either Brinell or Rockwell (B) hardness is permissible

8. Metallography:

Microscopic Structure:
i) Grain Size   ≥ grade 4
ii) Inclusion (Sulfide):              ≤ grade 1.5
                   (Alumina):            ≤ grade 1.5
                   (Silicate):              ≤ grade 1.5
                   (Globular Oxide):  ≤ grade 1.5
                   (Titanium Nitride): ≤ grade 1.5

Macroscopic Structure:
i) After acid etching, the transverse macroscopic structure of steel plates shall be free of visible residual shrinkage, crack and inclusion.

9. Intergranular Corrosion Resistance Property:

Sample sensitization at 650°C for 2 hrs. No Intergranular attack

10. Non-Destructive Testing:

i) Visual Inspection 100%
The surfaces of steel plates shall be flat, and the flatness shall be equal to or less than l0mm/m.
Plates shall be free of oxides and over-pickled pits, and also free of such defects as cracks, stratifications, scabs, bubbles, slag inclusions and shrinkages on the surfaces of steel plates. .
The injurious surface defects can be removed by grinding; but alter the grinding, the minimum thickness of steel plates shall be assured.

ii) Ultrasonic Testing 100%
Following defects are not permissible in plates:
a) Any injurious defects such us white points, cracks etc.
b) Any defects causing the amplitude of back reflection reducing to less than 30% of the full screen height
c) Any defect with the equivalent diameter being equal to or greater than one sixth of the plate thickness when it is greater than 12mm
d) Any defect with the equivalent diameter being equal to or greater than Ø2mm when the plate thickness is equal to or less than 12mm
e) Two or more adjacent defects, with the equivalent diameters being less than the above specified values individually, but with the separation distance between two adjacent ones being less than or equal to one fifth of the plate thickness and the sum of their equivalent diameters is greater than one fifth of the plate thickness

11. Certification Required:

All the requisite testing / processing certification to ensure that the material meets specification, but not less than mentioned certifications:
  • Solid Solution Heat Treatment Regime
  • Melting Furnace Number, Heat Treatment Furnace Number, Lot Number, Dimension and Weight
  • Chemical Composition
  • Dimensional Inspection
  • Tensile Testing
  • Metallographic Examination
  • Intergranular Corrosion
  • Surface Quality Inspection
  • Ultrasonic Examination
  • Results of Retest (if any)

12. Re-Examination:

In sampling tests, if (he results of the specimens fail to meet the requirements for any item, double specimens shall be taken and retested for that item.
Lot will he rejected in case re-examination is not qualified.

13. Packaging & Delivery Conditions:

  • Packaging and marking shall be in accordance with GB/T 247.
  • Packing container must indicate:
Contract No., Size, Lot No., Net and Gross Weight, Quantity and Supplier Identification

14. Applicable Standards:

GB/T 222 GB/I4334
GB/T 223 GB/T 4338
GB/T 226 GB/T 6394
GB/T 228 GB/T 10561
GB/T 247 GB/T 20066
GB/T 1979 PC8-FA-304TC